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damage, while the dynamic collapse is caused by adiabatic shear localization. Furthermore, the shear zone approximately keeps a constant width, the width of shear zone continually narrowdown from a plastic region to a narrow band, namely adiabatic shear band, under dynamic loading. Moreover, the width of quasi-static loading is evidently lager than that of the dynamic loading. Key words: TA2......
H, MEYERS M. Adiabatic shear localization in titanium and Ti-6Al-4V alloy[J]. Metallurgical Transaction A, 1985, 16: 761-755. [11] MARTINEZ F, MURR L E, RAMIREZ A C, et al. Dynamic deformation and adiabatic shear microstructures associated with ballistic plug formation and fracture in Ti-6Al-4V targets[J]. Materials Science and Engineering A, 2007, 454/455: 581-589. [12] MURR L E, MARTINEZ F......
TB10钛合金的动态力学性能及绝热剪切分析 张翥1,惠松骁1,叶文君1,王希哲1,于洋1,尤振平1 (1.北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京lO0088) 摘要:利用分离式的H0pkinson压杆,得到了不同组织状态的近β型TB10钛合金在高应变率下的动态压缩应力.应变曲线,结果表明:TB10钛合金的三种组织状态都表现出应变率敏感性.通过光学显微镜分析其显微组织的变化规律,结果表明:两相区固溶+时效,两相区固溶+双重时效的试样中均可观察到明显的绝热剪切带,且沿剪切带出现裂纹;单一固溶态试样金相观察表明晶粒的变形是均匀的.没有观察到绝热剪切带.在单一固溶态试样中出......
钢的强导比与绝热剪切敏感性关系的研究 王富耻1,王超1,李树奎1,苏铁健1 (1.北京理工大学,材料科学与工程学院,北京,100081) 摘要:提出用钢的强度与热导率的比值(强导比)来表征钢的绝热剪切敏感性.通过对若干钢约束爆炸圆管试验结果的分析表明:随强导比的降低,钢在一定爆轰条件下的绝热剪切敏感性增加,表现为剪切带密度下降,同时相变带过渡到形变带;对应一定的爆轰条件,强导比有两个临界值,如果强导比值低于较小的临界值,材料将不以绝热剪切方式(集中的剪切变形)破坏;较大的临界值决定材料绝热剪切变形的方式,当材料的强导比低于它时材料以形成形变带的形式失效,反之则以"白亮带"形式破坏. 关......
素Y的添加有利于绝热剪切带的形成. 关键词:93W-4.9Ni-2.1Fe; 晶粒细化; 绝热剪切带; 钇; 93W-4.9Ni-2.1Fe; grain refinement; adiabatic shear band; yttrium; [全文内容正在添加中] ......
一种改进的板带在线控制算法的研究杜凤山1,2,张尚斌1,黄华贵2,王贵国2,任新意2,于玉真2(1.河北省秦皇岛市燕山大学机械工程学院机械系2.河北省秦皇岛市燕山大学亚稳材料制备技术与科学国家重点实验室)摘 要:为了提高板带轧制力的计算速度和计算精度,提出了离散块元法.该法是将变形区划分为有限离散单元,考虑剪切变形作用,经BP神经网络训练获取其各种工况下的剪切变形因数模型而建立的高速计算模型,在平面变形条件下实现了对板带轧制力的预测,经该方法建立的轧制力计算模型具有较高的计算精度和计算速度,并在现场中得到了应用......
, WANG Ren-ke, et al. Adiabatic shear behaviors of cold-rolled pure copper under different deformation degrees[J]. The Chinese Journal of Nonferrous Metals, 2021, 31(7): 1809-1817. DOI: 10.11817/j...(Adiabatic shear band, ASB).从图4(a)~(c)可以看出,3个样品剪切带的宽度呈现一致的变化趋势,即沿着剪切方向从样品的顶端至底端,剪切带的宽度逐渐减小,可知剪切带内的变形程度不均匀且在应变较大的样品中更为剧烈.再者,随着应变的增大,试样底端的裂纹向剪切区域中部扩展也变得愈加狭长.XUE等[15]认为这是由于帽形试样本身的特点,在冲击载荷作用下,其两端会出现一段豁口.豁口会随着应变的增大......
宝钢厚板厂滚切式双边剪剪切质量的改善贾斌1,彭艳1,俞之光2,王磊2,张向葵2(1.河北省秦皇岛市燕山大学轧制设备及成套技术教育部工程研究中心2.宝山钢铁公司厚板厂,上海 201900)摘 要:结合厚板厂实际生产,针对剪切工艺参数和设备运行状态对剪切质量的影响,分析了剪切缺陷"毛刺"和"错刀"的产生原因,确定主要影响因素为剪刃间隙和钢板跑偏.用Matlab工具箱回归出最佳剪刃间隙与板厚的经验公式,通过现场跟踪测试明确了夹送辊调整状态对钢板跑偏的影响规律.基于以上研究结果制定了相应的调整和控制策略,并进行了现场跟......
of adiabatic shear band (ASB) are affected by both geometric and structural factors. The increase of dislocation density, structure fragment and temperature rise in the deformation-affected regions..., the sandwich structure in the middle of shear region is also possible to serve as favorable nucleation sites for crack initiation. Key words: Ti-6Al-2Zr-1Mo-1V alloy; adiabatic shear band; split Hopkinson......
that there are obvious signs of hot melt existing on the surface of the projectile, a lot of adiabatic shear bands inside the projectile, and microcracks exist at the end of adiabatic shear bands. The test results show that adiabatic shear is the main form to cause the projectile failure and it is the emergence of the adiabatic shearing phenomenon that makes 93 W display good self-sharpening property......
