Investigation on True Stress-Strain Curves of Flat and Corner Regions of Cold-Formed Section Using 3D Digital Image Correlation Method

Figure 10

Capture of true stress-strain curves of flat coupon: (a) diagram of real-time section area capture of flat coupon; (b) average strain; (c) true cross-section area; (d) true stress-strain curves of flat coupons.

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(b)

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(d)