What are the effects upon PMUT technologies when dealing with residual stresses?
Best insight from top research papers
Residual stresses have significant effects on PMUT technologies. They can cause a shift in the fundamental frequency and affect the performance parameters of PMUTs, such as transmitting sensitivity and vibration amplitude. The introduction of tensile residual stresses can lead to a transition from a plate regime to a membrane regime, resulting in differences in the scaling of figure-of-merits with size. V-shaped springs have been proposed as a solution to release residual stress and achieve a flat vibrating membrane, leading to enhanced transmitting sensitivity . Flexures designed as torsion springs can also release stress and increase the electromechanical coupling of the membrane . Additionally, the influence of residual film stresses and electrical diaphragm tensioning has been considered in the design of PMUTs, leading to improved transmission power efficiency and reduced harmonics .
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
21 Jul 2013 21 Citations | The effects of residual stresses on PMUT technologies are considered in the paper. The derived equivalent circuit model takes into account the influence of residual film stresses on the performance of the PMUT. |
01 Jan 2019 1 Citations | Residual stress can significantly hinder the performance of pMUTs, particularly the transmitting sensitivity. The paper discusses the use of V-shaped springs to release residual stress and enhance the transmitting sensitivity of pMUTs. |
43 Citations | The paper discusses the effects of residual tension on PMUT technologies and verifies experimentally the transition of PMUTs from plate regime to membrane regime due to the introduction of tensile residual stresses. |
| The paper discusses the effects of residual stresses on PMUT technologies, including the shift of the fundamental frequency and the initial static pre-deflected configuration of the diaphragms. | |
| The effects of residual stresses on PMUT technologies are reduced by the stress relief features in the device, making the membrane less sensitive to residual stress. |
Related Questions
What is the impact of electron beam welding on residual stresses in Ti6Al4V?5 answersElectron beam welding has been found to have an impact on residual stresses in Ti6Al4V alloy. The use of electron beam melting (EBM) during the welding process results in the formation of residual stresses in the welded joint. The residual stress levels can be influenced by various factors such as the processing parameters and the cooling time between layers. It has been observed that the interlayer cooling time has little effect on the temperature and stress evolutions, suggesting that shorter cooling times can be used to reduce manufacturing time. Additionally, increasing the preheating temperature can lead to a decrease in residual stress levels. The presence of a complex periodic scanning strategy during EBM can result in periodic temperature and stress fields. Overall, electron beam welding can induce residual stresses in Ti6Al4V alloy, and controlling the welding parameters can help mitigate these stresses.
Why and how residual stress in 3d printing?5 answersResidual stress occurs in 3D printing due to the rapid heating and cooling cycles during the process, leading to quality defects such as cracks, warpage, and deformation. The intensity and distribution of residual stresses depend on the printing technology, technique, and material properties. Different factors, such as printing nozzle diameter, model shape, and shell thickness, can affect the occurrence and magnitude of residual stresses. Modeling and simulation techniques are used to estimate and predict residual stresses in 3D-printed components. These techniques involve analyzing the thermal conductivity of the polymers used, simulating the printing process, and calculating stresses, strains, and deformations. Experimental validation is often performed to verify the accuracy of the simulation predictions. Understanding and controlling residual stresses are crucial for optimizing part design and printing parameters to minimize defects and improve the functionality of 3D-printed components.
How can transmission electron microscopy be used to measure residual stress?5 answersTransmission electron microscopy (TEM) can be used to measure residual stress by bombarding a thin slice of the specimen with an intensely focused single-energy electron beam. The transmitted electron beam is highly magnified using a series of electromagnetic lenses, allowing for visualization of the sample at atomic or nanometer resolution. TEM can visualize tiny crystals and can be integrated with 3D electron diffraction tomography for precise crystal structure determination. Additionally, a modified version of TEM called scanning transmission electron microscopy (STEM) offers diffraction, imaging, and spectroscopic details of samples up to atomic or nanometer resolution. TEM can also be integrated with energy-loss spectroscopy or X-ray energy diffractive spectroscopy for further analysis in nanoscience.
What depends on the residual tensile stress in UHPC?4 answersThe residual tensile stress in UHPC depends on the number of cycles and the stiffness of the material. Additionally, the ambient humidity during curing and storage can greatly influence the tensile strength of UHPC. The stress-strain relationship in tension is also an important factor in determining the flexural capacity of UHPC. Furthermore, the post-crack tensile characteristics of UHPC, including the residual tensile stress, can be determined using the notched three-point bending test and finite element analysis. Finally, the dynamic properties of UHPC, including the tensile resistance, can be experimentally determined using Hopkinson Pressure Bar tests and validated through numerical fracture simulations.
What are the effects of residual stress on the mechanical properties of concrete-filled steel tubes?5 answersThe effects of residual stress on the mechanical properties of concrete-filled steel tubes (CFSTs) have been studied in several papers. The presence of a gap between the steel tube and the core concrete in CFSTs due to inappropriate construction can result in a change in the load-carrying capacity. Inner steel L-profiles embedded in the core concrete can effectively improve the tensile performance of CFSTs, and the bond-slip constitutive relationship between the steel angle and core concrete has been analyzed. Detecting internal defects in CFST columns is important, and acoustic wave propagation has been used to study the internal defects of CFSTs. The use of demolished concrete lumps (DCLs) as partial coarse aggregate replacements in CFSTs has been investigated, and it has been found that DCLs have a slight effect on the mechanical performance of CFST columns. The residual bond strength between the steel tube and outside concrete after high temperature cooling has also been studied, and it has been observed that the bond failure load decreases with increasing temperature.
How control residual stress in direct metal deposition?5 answersResidual stress in direct metal deposition (DMD) can be controlled through various methods. One approach is to use alloy design, engineering of solid-state transformations, and the introduction of both hard and soft metallic phases to mitigate residual stresses in additively manufactured components. Another method is to use a novel artificial neural network-based modeling approach integrated with finite element analysis to accurately and efficiently predict residual stress distributions based on process parameters and geometrical features of DMD built parts. A physics-based analytical model can also be used to predict stress distribution by considering the in-process temperature field, thermal stresses induced by temperature gradients, and the incremental plasticity and kinematic hardening behavior of the metal. Additionally, a coupled finite element and multiphase field framework can be employed to understand the quantitative relationship between process parameters, temperature history, thermally-induced residual stresses, and microstructures in DMD. Mechanical vibration during the DMD process can also be used to reduce residual stress in the deposited workpiece.