ZHUANG Tao WANG Zhongfang Central Iron and Steel Research Institute
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Ministry of Metallurgical Industry
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Beijing Dept.No.13
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Central Iron and steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China
金属学报(英文版)
The crack tip stress-strain fields of the elastic-plastic cracked specimens have been analyzed using finite element calculations.The crack initiation and steady propagation behaviours have also been investigated by means of slip line pattern etching technique and mechanical tests. The results show that there are HRR near field and distant field in the crack tip region,and the later depends on the specimen configuration.The crack initiation behaviour is controlled by a single parameter J.In contrast,the steady crack propagation is affected by the distant strain field and can not be described by single parameter only.
关键词:
plane stress
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null
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null
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null
章顺虎
,
赵德文
,
张雷
,
高彩茹
,
王国栋
材料科学与工艺
为了得到斜板极限载荷的解析解,用平均屈服（MY）准则,对受均布载荷的简支金属斜板进行了塑性极限分析.首次获得MY准则下斜板极限载荷的解析解,该解是斜板几何参数长l1,宽l2以及长宽夹角θ的函数.研究表明：随着θ的增大,极限载荷先增大而后减小;斜板面积增加,极限载荷减小.得到了菱形、矩形和方形板的解析解,并将方形板的解析解与Tresca、Mises以及TSS提供的极限载荷进行比较,对比表明：方板的极限载荷与边长成反比关系,Tresca屈服准则提供极限载荷的下限,TSS屈服准则提供上限,MY准则预测结果恰居二者中间,且最靠近Mises解.
关键词:
MY准则
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斜板
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方板
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平面应力
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极限载荷
薛钢
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宫旭辉
,
王涛
,
方洪渊
,
高珍鹏
材料开发与应用
针对10Ni5CrMoV钢采用0Cr18Ni24Mo6N奥氏体焊条焊接形成的“铁素体-奥氏体-铁素体”异质接头,采用薄片试样疲劳试验研究了无加强高和带加强高两种情况下平面应力状态接头的疲劳行为,并建立了带加强高接头S-N疲劳曲线.结果表明,无加强高情况下疲劳裂纹在焊缝金属内启裂并扩展;带加强高情况下疲劳裂纹在焊趾处启裂、并近似垂直载荷方向在母材内扩展至断裂,寿命较无加强高情况大幅降低,且启裂寿命占疲劳总寿命的比例较高,达到70％-80％.
关键词:
平面应力
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异质接头
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疲劳性能
