Showing papers in "Journal of Strain Analysis for Engineering Design in 2018"
TL;DR: In this paper, a novel approach of the fatigue crack growth rate description has been proposed based on theoretical and experimental approach, the mean stress effect expressed by R-ratio is pre
Abstract: In this research, a novel approach of the fatigue crack growth rate description has been proposed Based on theoretical and experimental approach, the mean stress effect expressed by R-ratio is pre
34 citations
TL;DR: In recent decades, ultrasonic vibrations are used in manufacturing processes because they can improve tool life, material performance, and quality as discussed by the authors, and one of them which can be integrated with ultrason...
Abstract: In recent decades, ultrasonic vibrations are used in manufacturing processes because they can improve tool life, material performance, and quality. One of them which can be integrated with ultrason...
28 citations
TL;DR: Enhanced computational method called Separable Monte Carlo is employed to evaluate the time-dependent reliability of pipeline segments containing active corrosion defects, where a practical example was used and results show that the Separables Monte Carlo simulation method not only minimizes the computational cost strongly but also improves the calculation precision.
Abstract: The evaluation of the failure probability of corroded pipelines is an important calculation to quantify the risk assessment and integrity of pipelines. Traditional Monte Carlo simulation method has...
27 citations
TL;DR: For engineering components subjected to complex multiaxial loadings, critical plane approaches like Fatemi-Socie criterion have been commonly utilized for life prediction of these components as mentioned in this paper.
Abstract: For engineering components subjected to complex multiaxial loadings, critical plane approaches like Fatemi–Socie criterion have been commonly utilized for life prediction of these components. Withi...
26 citations
TL;DR: In this paper, a parametric analysis of the twodimensional digital image correlation extrinsic and intrinsic setting parameters is performed, in a balance between spatial resolution and resolution, in the presence of the high deformation gradient fields generated by the structure-property relationships at the scale of observation.
Abstract: This work addresses the reconstruction of strain gradient fields at the wood growth ring scale from full-field deformation measurements provided by digital image correlation. Moreover, the spatial distribution of the earlywood and latewood radial modulus of elasticity is assessed. Meso-scale tensile tests are carried out on Pinus pinaster Ait. Wooden specimens oriented in the radial–tangential plane under quasi-static loading conditions. A parametric analysis of the twodimensional digital image correlation extrinsic and intrinsic setting parameters is performed, in a balance between spatial resolution and resolution. It is shown that the parametric module is an effective way to quantitatively support the choice of digital image correlation parameters in the presence of the high deformation gradient fields generated by the structure–property relationships at the scale of observation. Under the assumption of a uniaxial tensile stress state, the spatial distribution of the radial elastic modulus across the growth rings is obtained. It is observed that the ratio of the radial modulus of elasticity between latewood and earlywood tissues can vary significantly as a function of the digital image correlation parameters. It is pointed out, however, that a convergence value can be systematically established. Effectively, earlywood and latewood stress–strain curves are obtained and elastic properties are determined assuming the converged digital image correlation setting parameters.
26 citations
TL;DR: In this paper, the dynamic characteristics of a planetary gear set can be greatly affected by a localized fault in the planet bearing, and the relationship between the dynamic characteristic of the planetar gear set and the fault is analyzed.
Abstract: Dynamic characteristics of a planetary gear set can be greatly affected by a localized fault in the planet bearing. To understand the relationship between the dynamic characteristic of the planetar...
23 citations
TL;DR: In this article, the authors focused on the characterization of the stress intensity factor range for a compact tension specimen tested under a uniaxial tensile fatigue loading condition, and the experimental soluti...
Abstract: This work concentrates on the characterization of the stress intensity factor range for a compact tension specimen tested under a uniaxial tensile fatigue loading condition. The experimental soluti...
22 citations
TL;DR: It is concluded that small samples make the real representation of life difficult to the material fatigue, but using the weighted least squares estimation method, it is possible to obtain more estimates.
Abstract: Knowledge of the stochastic nature of fatigue life of composite materials can be modeled by the failure time with the Weibull distribution. This task becomes complex when the samples are small and ...
20 citations
TL;DR: Tempered martensitic steels are used for turbine components in power plants under high temperatures (T≈873K) as mentioned in this paper, and turbine components are subjected to temperature changes during start-up and shutdown.
Abstract: Tempered martensitic steels are used for turbine components in power plants under high temperatures (T≈873K). In addition, the components are subjected to temperature changes during start-up and sh...
20 citations
TL;DR: Laser bending is one of the thermal forming processes which in each pass of it, the temperature of sample increases at heat-affected zone during irradiation time considerably and then it cools to n...
Abstract: Laser bending is one of the thermal forming processes which in each pass of it, the temperature of sample increases at heat-affected zone during irradiation time considerably and then it cools to n...
20 citations
TL;DR: In this paper, the effect of data acquisition parameters on the displacement and strain uncertainties of kinematic fields is assessed via Digital Volume Correlation (DVC) applied to three-dimensional (3D) data sets imaged by synchrotron laminography.
Abstract: The eect of dierent data acquisition parameters on the displacement and strain uncertainties of kinematic elds is assessed via Digital Volume Correlation (DVC) applied to three-dimensional (3D) data sets imaged by synchrotron laminography. The measurement uncertainty is estimated for i) dierent materials and associated varying contrast, ii) repeated scans, i.e., uncertainty due to the imaging system and 3D reconstruction iii) rigid body motions between two subsequent scans, iv) rescaling of the gray level histogram during 32-bit oating point to 8-bit integer data conversion, v) changes in the beam properties, i.e., use of a monochromator or an undulator, and vi) changes in cam-era/detector characteristics. It is found that the amount of image contrast is not the only parameter that controls uncertainties for different materials. Further, the rigid body motion procedure should be preferred over repeated scans as it provides more conservative measurement uncertainty values. The applied 32 to 8-bit conversion procedure, beam tuning and detector characteristics hardly aect the measurement uncertainty.
TL;DR: In this paper, the most promising ultrasonic signal processing methods (discrete wavelet transform, variational mode decomposition and Hilbert transform) are applied for the analysis of disbond-type durations.
Abstract: In this work, the most promising ultrasonic signal processing methods—discrete wavelet transform, variational mode decomposition and Hilbert transform—are applied for the analysis of disbond-type d...
TL;DR: In this paper, standard test methods for measuring temperature-specific mechanical properties are typically specimen and time intensive when the influence of varying parameters is taken into consideration, such as temperature and humidity.
Abstract: Standard test methods for measuring temperature-specific mechanical properties are typically specimen and time intensive when the influence of varying parameters is taken into consideration. Often,...
TL;DR: An analytical method based on the extended expanding cavity model was proposed in this article to determine the proof strength Rp 0.2 and flow properties of materials that obey the Johnson-Cook consti...
Abstract: An analytical method based on the extended expanding cavity model was proposed in this study to determine the proof strength Rp0.2 and flow properties of materials that obey the Johnson–Cook consti...
TL;DR: In this paper, a single grain can contract or expand in the transverse direction when it is stretched, and it becomes complex when the single grain is embedded in a stretched polycrystal, due to the grain neighbor-hoops.
Abstract: A single grain can contract or expand in the transverse direction when it is stretched. It becomes complex when the single grain is embedded in a stretched polycrystal, due to the grain neighborhoo...
TL;DR: In this article, the complementary functions method is used to determine natural frequencies of functionally graded non-uniform disks, and validation and observation of converges are done using analytical and ANSYS results for a simple power law model uniform disk.
Abstract: Free vibration analysis of heterogeneous (functionally graded) and non-uniform (variable thickness) disks using plane elasticity results in a two-point boundary value problem. Spatially varying mechanical and thickness properties yield variable coefficient governing differential equations where obtaining closed-form solutions are not possible except for certain simple grading and thickness functions. This article uses complementary functions method as a novel approach to determine natural frequencies of functionally graded non-uniform disks. The validation and observation of converges are done using analytical and ANSYS results for a simple power law model uniform disk. The proposed solution method can be applied for disks with any continuous thickness and material grading functions.
TL;DR: In this article, an explicit finite element model with real boundary conditions is developed together with a converged mesh for the fillet radius to predict residual stresses during the crankshaft design cycle.
Abstract: Deep rolling is performed on crankshafts since the 1960s, yet there is still a knowledge gap regarding residual stress generation. Until this moment, there is no consolidated and widespread procedure to predict such stresses during the crankshaft design cycle. This study establishes an analysis procedure and correlates it with experimental results. An explicit finite element model with real boundary conditions is developed together with a converged mesh for the fillet radius. Simulation nodal displacement and strain output are compared to geometrical measurements using a coordinate-measuring machine. Outputs in terms of residual stresses are related to X-ray diffraction measurements taken along fillet depth. The experimental results attest to the accuracy of the model and correctness in predicting the process outcomes.
TL;DR: In this paper, the accuracy of the obtained geometries was investigated and the authors showed that the accuracy depends on the quality of the air-breathing process and the available materials.
Abstract: Press brake air bending, a process of obtaining products by sheet metal forming, can be considered at first sight a simple geometric problem However the accuracy of the obtained geometries involve
TL;DR: In this article, a constitutive material model to predict elastic-plastic behavior of fiber metal laminates is introduced, and constants of the model can be obtained from the geometry and mec...
Abstract: In this investigation, a constitutive material model to predict elastic–plastic behavior of fiber metal laminates is introduced. The constants of the model can be obtained from the geometry and mec...
TL;DR: In this article, Hashin failure criteria were enhanced with Puck's action plane concept to develop a user material model that can accurately predict the damage development inside the composite lamina.
Abstract: In this study, Hashin failure criteria were enhanced with Puck’s action plane concept to develop a user material model that can accurately predict the damage development inside the composite lamina...
TL;DR: Wear debris from ultra-high-molecular-weight polyethylene components used for joint replacement prostheses can cause significant clinical complications, and it is essential to be able to predict im...
Abstract: Wear debris from ultra-high-molecular-weight polyethylene components used for joint replacement prostheses can cause significant clinical complications, and it is essential to be able to predict im...
TL;DR: The international safety regulations are pushing the manufacturers of water systems and equipment to remove lead from material compositions due to the potential human hazard of lead absorption as mentioned in this paper, which is called lead-free water.
Abstract: The international safety regulations are pushing the manufacturers of water systems and equipment to remove lead from material compositions due to the potential human hazard of lead absorption. The...
TL;DR: Yarn surface to metal friction is an important consideration in the subsequent process of knitting and weaving as it influences mainly the ends down rate, fly generation, process efficiency, wear.
Abstract: Yarn’s surface to metal friction is an important consideration in the subsequent process of knitting and weaving as it influences mainly the ends down rate, fly generation, process efficiency, wear...
TL;DR: In this article, the displacement fields of in situ tests within X-ray computed tomography scanners (i.e., lab-scale Xray computed computed tomograph) were measured.
Abstract: The measurement of four-dimensional (i.e. three-dimensional space and time) displacement fields of in situ tests within X-ray computed tomography scanners (i.e. lab-scale X-ray computed tomography)...
TL;DR: In this paper, the formability limits by fracture obtained from standard bulk metal forming tests performed with cylindrical, tapered and flanged specimens were investigated and a total of two novel feature features were proposed.
Abstract: This article is focused on the formability limits by fracture obtained from standard bulk metal forming tests performed with cylindrical, tapered and flanged specimens. A total of two novel feature...
TL;DR: In this article, the orthotropic stiffness components of Pinus pinaster Ait wood are simultaneously determined by means of a heterogeneous plate bending test, and the proposed inverse identification approach couples full-...
Abstract: Orthotropic stiffness components of Pinus pinaster Ait. wood are simultaneously determined by means of a heterogeneous plate bending test. The proposed inverse identification approach couples full-...
TL;DR: The ring core technique as discussed by the authors allows for the determination of non-uniform residual stresses from the surface up to relatively higher depths as compared to the hole-drilling technique, and the integral method...
Abstract: The ring-core technique allows for the determination of non-uniform residual stresses from the surface up to relatively higher depths as compared to the hole-drilling technique. The integral method...
TL;DR: Cables are used in civil and mining engineering applications, such as in cable stays for suspension bridges, elevators, construction cranes, mining shovels and draglines.
Abstract: Cables are used in civil and mining engineering applications, such as in cable stays for suspension bridges, elevators, construction cranes, mining shovels and draglines. Such cables are mainly use...
TL;DR: In this article, the erosion effect of sulphate solution on the flexural fatigue behavior of fly ash-based geopolymer concrete was investigated under cyclic bending loading, and the effect of sulfate a...
Abstract: In this work, the erosion effect of sulphate solution on the flexural fatigue behaviour of fly ash–based geopolymer concrete was investigated. Under cyclic bending loading, the effect of sulphate a...
TL;DR: In this paper, the identification of material parameters of multi-material members is a problem in engineering parts and natural soft members, which consist of several phases with different mechanical properties, and identification of materials parameters of multilayer parts is a challenge.
Abstract: There are many engineering parts and natural soft members, which consist of several phases with different mechanical properties. Identification of material parameters of multi-material members is a...