Separation and fracture toughness of controlled rolled steel.
Separation and fracture toughness of controlled rolled steel.
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控制轧制钢的分离和断裂韧性。
DOI：
10.2472/jsms.34.388
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
N. Ogura
中科院分区：
文献类型：
--
作者：
K. Ando;H. Matsushita;Shinpei Fujibayashi;N. Ogura
对高强度控轧钢在宽温度范围内进行了断裂力学试验。采用紧凑拉伸和三点弯曲试样，详细研究了该材料的断裂韧性、疲劳断裂韧性和起裂性能。（1）提出了一个新的分选指标，即分选深度指数（S.D.I.），由于该指数对塑性约束和温度的敏感性，它是一个很好的参数。(2)发现试验材料显示出奇异的延性-脆性转变行为。转变温度下的J积分约为0.02MJ/m ~ 2，比普通可焊结构钢的J积分约小两位数。(3)控制轧制钢的奇异韧脆转变行为是由于缺口前塑性约束的急剧下降引起的，这是由于分离的开始。
Fracture mechanics tests have been made on high strength, controlled rolled steel in a wide temperature range. Fracture toughness, fatigue fracture toughness and separation initiation properties have been investigated in detail by using compact tension and three points bending specimens. The main conclusions obtained are as follows:(1) Anew separation index i, e, separation depth index (S.D.I.), was proposed, and this index was shown to be a good parameter because of its sensitivity to plastic constraint and temperature.(2) The test material was found to indicate singular ductile-brittle transition behaviour. The J integral at the transition temperature was about 0.02MJ/m2, which is about two figures smaller than that of ordinary weldable structural steel.(3) The singular ductile-brittle transition behaviour of the controlled rolled steel is caused by the rapid decrease of plastic constraint ahead of the notch which results from the initiation of separation.