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首页> 外文会议>Iron Steel Supplement 2005 vol.40: The Joint International Conference of HSLA Steels 2005 and ISUGS 2005 >Experimental Study on the Strength and Toughness Properties of HSLA Steel under Dynamic Loading
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Experimental Study on the Strength and Toughness Properties of HSLA Steel under Dynamic Loading

机译：动态载荷作用下HSLA钢强韧性的试验研究

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摘要

The specific type of specimens were prepared from X80 pipeline steel with perpendicular sampling orientation for the dynamic testing of impact tensile at given strain rate, 10~2 /s and instrumented pendulum impact with the given stress intensity factor rate, 5 x 10~5 MPa·m~(1/2)/s in the present paper. The comparison of the yield stress and tensile strength corresponding to quasi static and dynamic loading clearly indicates that the strength of X80 steel is sensitively dependent of the strain rate change. With the increase of strain rate from 10~(-2)/s to 10~2/s, the strength values rise by nearly 100MPa. The flow yield stress i.e. σ_(yd) was accurately determined as the average of the first two peak and valley stress values on stress-strain curve from impact tensile test. The correlation of σ_(yd) and F_(gy) obtained from instrumented impact by means of Server equation was proved to be satisfactory. Whereas, the application of Server equation for the estimation of dynamic ultimate tensile strength i.e. σ_(bd) from maximum force, i.e. F_m was invalid just for the studied steel here. In addition, dynamic crack extension resistance curve, J-Δa, was acquired for the evaluation of toughness property, also effectively revealing the mechanism of crack initiation and growth under dynamic loading.
机译：从垂直方向取样的X80管线钢制备特定类型的试样，以便在给定应变率10〜2 / s的条件下对冲击拉伸进行动态测试，并在给定应力强度因子比率为5 x 10〜5 MPa的条件下进行摆锤式冲击试验。 ·m〜（1/2）/ s。比较对应于准静态和动态载荷的屈服应力和抗拉强度，可以清楚地表明X80钢的强度与应变率变化密切相关。随着应变率从10〜（-2）/ s增加到10〜2 / s，强度值增加了近100MPa。流动屈服应力即σ_（yd）是根据冲击拉伸试验测得的应力-应变曲线上的前两个峰值和谷值的平均值。证明通过Server方程从仪表化冲击获得的σ_（yd）和F_（gy）的相关性令人满意。然而，Server方程用于根据最大力即F_m估算动态极限抗拉强度即σ_（bd）的应用仅对此处研究的钢无效。此外，获得了动态裂纹扩展阻力曲线J-Δa，用于评估韧性，也有效揭示了动态载荷下裂纹萌生和扩展的机理。

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