... curves at various temperatures, as shown in Fig. 17 . 3 The viscoplastic parameters such as Q , s , s s , and h can be roughly fitted from the compression tests at different strain rates (Fig. 18 ). The ratio Q / s determines the strain rate dependence of the yield strength, and s / s s...

... compressive testing elasticity polymer foams stress-strain relations Elastic (or flexible ) polyether polyurethane foams (EPP foams for short) are a type of cellular material employed in numerous engineering applications. In the aeronautical industry, for example, the cores of light sandwich...

...Enrico Ferri; V. S. Deshpande; A. G. Evans Dynamic out-of-plane compressive testing was used to characterize the dynamic strength of stainless steel prismatic cores with representative double layer topology to be employed in sandwich panels for blast protection. Laboratory-scaled samples...

... surface of brittle materials is not well characterized (or even defined), and the failure process may change the material properties. Recently, some works have shown that it is possible to characterize and find the constitutive equation for brittle materials using a confined compression test, i.e., a test...

... system is constructed to measure the rise in temperature of a polymer during high strain rate compression testing. Temperature measurements were made using a high-speed mercury-cadmium-telluride (HgCdTe) single-element photovoltaic detector sensitive in the mid-infrared spectrum ( 6 – 12 μ m ) , while...

...Sia Nemat-Nasser; Jeom Yong Choi; Jon B. Isaacs; David W. Lischer To investigate the buckling behavior of thin and relatively thick cylindrical shape-memory shells, uniaxial compression tests are performed at a 295 K initial temperature, using the CEAM/UCSD’s modified split Hopkinson bar systems...

...N. D. Cristescu, Graduate Research Professor, Mem. ASME 15 03 2005 alumina powders brittleness microcracks fracture mechanics elasticity compressive testing hydrostatics In the article, the damage discussed is the microcracks existing in any brittle material...

... . Ravichandran , G. , and Subhash , G. , 1994 , “ Critical Appraisal of Limiting Strain Rates for Compression Testing of Ceramics in a Split Hopkinson Pressure Bar ,” J. Am. Ceram. Soc. , 77 , pp. 263 – 267 . Karnes , C. H. , and Ripperger , E. A. , 1966 , “ Strain Rate Effects in Cold...

..., is theoretically analyzed on the basis of the asymptotic method. The theoretical results are compared with experimental ones obtained from a compression test realized on an elastic tube inserted in a foam. It is found that the Euler pressure and the associated buckling mode index strongly depend upon...