Small punch test shear

Characteristic features observed on load-displacement curves obtained using the shear punch apparatus. An initial and hardening stiffness in addition to the peak load are the primary metrics used to perform analytical comparisons. Like the conventional small punch test, the shear punch test also may be interpreted qualitatively. (Adapted from Kurtz et al. 2002.)... 

How does the shear punch test differ from the small punch test Explain how the stress state in the deformed region evolves as the test progresses. 

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