scispace - formally typeset
Search or ask a question
Topic

Hydrostatic stress

About: Hydrostatic stress is a research topic. Over the lifetime, 1568 publications have been published within this topic receiving 37773 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the von Karman critical velocity for annealed aluminum is found to be a dividing point between two types of initial wave development, i.e., deviatoric and hydrostatic stress.
Abstract: Diffraction grating measurements are made of dynamic plastic strain within a few thousandths of an inch from the impact face of 1‐in. diameter, annealed aluminum specimens in free flight undergoing constant velocity impact. From these data it has been established that initial nondispersive shock fronts are present, even in low‐velocity impact. This initial nondispersive front develops in the first ¼ diameter in two sections, each involving ½ the initial kinetic energy; the first section is that of the deviatoric, or shear, component, and the second is associated with the hydrostatic stress. It is shown that the dynamic stress‐strain curves obtained experimentally in annealed aluminum and copper may be computed directly from the theory, using information supplied by the static stress‐strain curve. The von Karman critical velocity for annealed aluminum is found to be a dividing point between two types of initial wave development.

32 citations

Journal ArticleDOI
TL;DR: In this paper, a constitutive model is derived to include the progressive reduction of the bulk stiffness and the permanent volumetric change of carbon-black filled elastomers subjected to quasi-static loading.
Abstract: This study is concerned with inelastic effects of non-reinforcing carbon-black filled elastomers when subjected to periodic hydrostatic loading-unloading cycles in tension. During cyclic testing of sufficient magnitude, a critical state may be reached where microcavities suddenly grow inside the rubber, possibly initiated at sites of internal imperfections. As a result of cavitation damage the tensile bulk modulus in the natural configuration is reduced. A series of hydrostatic tension tests are performed at room temperature to provide new insight into the progressive deterioration of the bulk stiffness. We define dilatational stress softening as a phenomenon where the hydrostatic stress on unloading and subsequent submaximal reloading is significantly less than that on primary loading for the same volumetric strain. Dilatational stress softening during initial loading cycles and the permanent volumetric change upon unloading are not accounted for when the mechanical properties are represented in terms of a strain-energy function, i.e. if the material is modelled as hyperelastic. In this paper a constitutive model is derived to include the progressive reduction of the bulk stiffness and the permanent volumetric change of carbon-black filled elastomers subjected to quasi–static loading. The basis of the model is the theory of pseudo-elasticity, which including a softening variable modifies the dilatational strain energy function. An acceptable correspondence between the theory and the data is obtained.

32 citations

Journal ArticleDOI
TL;DR: In this paper, joints between various compositions of 3 mol% Y 2 O 3 -stabilized ZrO 2 /Al O 3 composites have been produced by superplastic flow at 1350 °C and strain rates of 1×10 −5 s −1.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the authors modeled the stress caused by misfitting particles in thin layers adherent to substrates and illustrated its implications for diffraction stress measurements using magnetron sputtered TiN layers.

31 citations

Journal ArticleDOI
TL;DR: In this paper, the failure mechanisms of air-plasma-sprayed ZrO{sub 2} thermal barrier coatings with various microstructures were studied by microscopic techniques after thermal cycling.
Abstract: The failure mechanisms of air-plasma-sprayed ZrO{sub 2} thermal barrier coatings with various microstructures were studied by microscopic techniques after thermal cycling. The elastic modulus (E) and hardness (H) of the coatings were measured as functions of the number of thermal cycles. Initially, both E and H increased by -60% with thermal cycling because of sintering effects. However, after -80 cycles (0.5 h at 980{sup o}C), the accumulated damage in the coatings led to a significant decrease of -20% of the maximum value in both E and H. These results were correlated with stresses measured by a spectroscopic technique to understand specific damage mechanisms. Stress measurement and analysis revealed that the stress distribution in the scale was a complex function of local interface geometry and damage in the top coat. Localized variations in geometry could lead to variations in measured hydrostatic stresses from -0.25 to -2.0 GPa in the oxide scale. Protrusions of the top ZrO{sub 2} coat into the bond coat were localized areas of high stress concentration and acted as damage-nucleation sites during thermal and mechanical cycling. The net compressive hydrostatic stress in the oxide scale increased significantly as the scale spalled during thermal cycling.

31 citations


Network Information
Related Topics (5)
Fracture mechanics
58.3K papers, 1.3M citations
86% related
Ultimate tensile strength
129.2K papers, 2.1M citations
84% related
Finite element method
178.6K papers, 3M citations
83% related
Grain boundary
70.1K papers, 1.5M citations
78% related
Microstructure
148.6K papers, 2.2M citations
78% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202318
202246
202134
202047
201948
201839