The strain test in the agricultural machinery field was used to probe the stress variation inside a frame in order to examine the strength of the plastics greenhouse frames.
为验证大棚骨架的强度，用农机测试中的应变测量法，来探索其内部应力的变化情况。
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The sta- tic relation between stress and strain of two kinds of foamed plastics material made in China are measured. The nonlinear elastic models of foamed …