However, flexural strength cannot be determined for those materials that do not break or that do not fail in the outer surface of the test specimen within the 5.0 % strain limit of these test methods.
2
屈服点是在应变有可观增加，应力没有增加的应力极限，在这个极限下，如果应变继续增加，应力就也会增加。
The yield point is the stress at which there is an appreciable increase in strain with no increase in stress, with the limitation that, if straining is continued, the stress will again increase.
3
结果表明，成形极限应力图不受应变路径影响，对于同一失稳准则，在不同加载应变路径下几乎为同一条曲线。
The result shows that FLSD is independent of strain path, and that the FLSD under different strain paths are almost the same curve according to the same instability theory.
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