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总览 评价 力天震 , 崔震 , 李博文 , 卞璇屹 , 沈超明 * ( 江苏科技大学船舶与海洋工程学院,江苏 镇江 212003; ) 摘要: 以单位长度扭转角为强化程度指标,并基于准静态拉伸实验,得到了未经强化及不同扭转强化程度的Q235钢的规定非比例延伸强度、抗
力天震, 崔震, 李博文, 卞璇屹, 沈超明*
(
江苏科技大学船舶与海洋工程学院,江苏 镇江 212003; )
摘要:
以单位长度扭转角为强化程度指标,并基于准静态拉伸实验,得到了未经强化及不同扭转强化程度的Q235钢的规定非比例延伸强度、抗拉强度、断后伸长率及断面收缩率等性能参数。实验分析结果表明,扭转强化能显著提高Q235钢的拉伸强度,其中对规定塑性延伸强度的提高幅度可达一倍以上;其塑性性能的下降呈现两头剧烈而中间平缓的"三段式"模式,其中第二阶段中塑性下降平缓,而强度提高显著,可得到较好的扭转强化效果。本文提出的扭转强化优选段的概念可作为一般工程应用的参考,针对实际工程问题时,可根据实际需要的强度和塑性性能,利用强度、塑性随单位长度扭转角的变化曲线选取最佳的扭转强化点,以达到最佳效果。
关键词:
Q235钢;扭转强化;拉伸实验;强度性能;塑性性能
Li Tianzhen, Cui Zhen, Li Bowen, Bian Xuanyi, Shen Chaoming*
(
School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China; )
Abstract:
Experimental study on tensile mechanical properties of Q235 steel with/without torsion reinforcement using quasi-static tensile experiment were presented in this paper, including proof strength,plastic extension, tensile strength, percentage elongation after fracture and percentage reduction of area. The torsion angle within unit length was employed as indicator. Experimental results show that tensile strength of Q235 steel increases significantly after torsion reinforcement. The proof strength,plastic extension increases by one hundred percent. The decrease of plastic property exhibits a 'three-stage mode'. In the second stage, the plastic property decreases stably but the strength increases significantly. Hence, the second is the prior stage. In practical engineering, the presented results could be employed to determine the optimal torsion reinforcement considering the required the strength and plastic properties.
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