Assuming a linear softening stress-equivalent crack opening relation, the numerical methodology is first validated against experimental results on plain concrete.
At the same time, the niobium and titanium carbide additions helped prevent grain growth and reduce local softening (yield stress reduction) in the heat-affected zone.
The developed polymer composite material shows the following stress-strain relation under high rate compressive loading: linear elasticity to a high yield stress, softening behavior with a slight stress decrease, plateau stress accompanied by a large plasticity and densification with a stress increase.
Hence, whole skin exhibited strain hardening while the dermis-only demonstrated stress softening under step-stress conditions.
In particular, it is shown that the magnitude of stress softening varies with strain in a non-monotonous manner and this non-monotonous character of the stress-softening phenomenon strongly depends on magnitude of the pre-strain.
Results of quasi-static tests at different temperatures revealed that the yield strength decreased with temperature, and the strain hardening behaviour was replaced with strain softening after the yield stress when the temperature was elevated.
The scratch depth and shoulder height of the groove formed during scratch, which has been shown to be directly related to the scratch visibility resistance of polymers, is simulated by varying a set of material constitutive parameters, namely, yield stress, strain softening slope, strain hardening slope, strain at stress recovery, and strain before hardening.
Make sure to anneal (soften, remove stress from) the brittle metal with sufficient heat and gradually cooling, if you are using brass, copper or sterling silver.
During tensile loading, the initial full icosahedra with local fivefold high-symmetry in CuxZr100-x MGs gradually transform into low-symmetry ones before reaching the maximum stress, which leads to the stress softening.
In this paper we first describe some experimental results that illustrate stress softening in particle-reinforced rubber together with associated residual strain effects.
