Mechanical properties and fracture mechanism of high strength steel sheet with low yield ratio under impact loading have been studied through instrumented impact and quasi-static tensile tests.

通过室温下的仪器化冲击试验和静态拉伸试验，研究一种低屈服比高强度钢板在冲击载荷下的力学性能和断裂机理。

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The yield strength, yield ratio increase with the increase of annealing temperature, due to the impact of non-martensite and the decrease of movable dislocation density.

受非马氏体组织的影响及可动位错密度降低的作用，屈服强度、屈强比随退火温度升高而升高。

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The yield strength, yield tensile ratio and toughness are major quality indexes of steel pipe (board). However, it is quite difficult to determine them reasonably.

屈服强度、屈强比、韧性等是钢管(板)的主要质量指标，合理确定这些指标的数值有相当难度。

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