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韧性剪切破坏
相关语句
  ductile shear failure
     When the imperfection approaches to the middle of left edge of the specimen,multiple shear bands are formed so that the relatively ductile shear failure modes are expected and the post-peak stress-axial deformation curve and stress-lateral strain curve of the specimen tend to be less brittle.
     当缺陷位于试样左边界中部附近时,试样内部出现多条剪切带,发生韧性剪切破坏,峰后应力-轴向应变曲线和应力-侧向应变曲线均倾向于韧性,岩样的稳定性增强;
短句来源
  相似匹配句对
     (2) The main factor affecting the failure mode is the shear span to depth ratio of the slab.
     (2)剪切冲陷破坏;
短句来源
     (3)The compound shear failure.
     (3)复合剪切破坏
短句来源
     SHEAR BAND BIFURCATION IN DUCTILE MATERIALS
     韧性材料的剪切带状分叉
短句来源
     THE RELATIONSHIPS BETWEEN THE DUCTILE SHEAR BELT AND GOLD DEPOSIT
     韧性剪切带与金矿的关系
短句来源
     The Investigation of the Testing Method on\;Fracture Toughness of Dental Adhesive Resins
     粘接性树脂破坏韧性试验方法的探讨
短句来源
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  ductile shear failure
New features of the low temperature ductile shear failure observed in bulk amorphous alloys
      
Fractographic studies of ductile shear failure under the uniaxial compression for rod-like samples of the Zr41.2Ti13.8Ni10Cu12.5Be22.5 and Cu50Zr35Ti8Hf5Ni2 bulk amorphous alloys at temperatures 300 and 77 K are presented.
      
Fracture occurs in both testing modes by ductile shear failure with elongated dimples originating mostly from the particle matrix interface.
      
Compared with the ductile shear failure of GRE10-ns, the shear failure of GRC10-ns is rather catastrophic.
      
The beams should have strong shear strength to avoid non-ductile shear failure by providing sufficient shear reinforcement.
      


Effects of positions of material imperfection at right edge of rock specimen under plane strain compression on initiation and evolution of shear bands as well as stress-strain curves of rock specimen were modeled numerically by FLAC. Two material imperfections were introduced in the form of null element at left and right edges of specimen, respectively. The material imperfection at left edge was fixed; however, the positions of material imperfection at right edge were different for different schemes. The adopted...

Effects of positions of material imperfection at right edge of rock specimen under plane strain compression on initiation and evolution of shear bands as well as stress-strain curves of rock specimen were modeled numerically by FLAC. Two material imperfections were introduced in the form of null element at left and right edges of specimen, respectively. The material imperfection at left edge was fixed; however, the positions of material imperfection at right edge were different for different schemes. The adopted failure criterion was a composite Mohr-Coulomb criterion with tension cut-off and post-peak constitutive relation of rock was linear strain-softening. Only one shear band bisecting specimen through two imperfections is formed and only full development of shear band below right material imperfection is permitted due to end restraint at top of specimen when right imperfection is close to the top. When right imperfection is not close to the top, shear bands are initiated in the vicinity of material imperfections and propagate along their inherent directions so that patterns of shear bands are very complex. Stress-strain curve beyond the peak strength exhibits steeper behavior when the number of shear bands intersecting specimen is lower. Otherwise, strain-softening branch of stress-strain curve undergoes ductile behavior. In the process of shear band propagation, when the tip of shear band head-on approaches two triangular regions affected by strong restraint at top or base of specimen, direction of shear band has to be changed. If the tip is very closer to the symmetrical line in vertical direction of specimen, direction of shear band will be slightly changed (the phenomenon is called shear band refraction). However, if the tip is not very closer to the symmetrical line, the direction will be changed greatly (the phenomenon is called shear band reflection).

在平面应变压缩条件下,通过在岩样左边界靠近下端面的位置及右边界的不同位置预制材料缺陷,采用拉格朗日元法研究了材料缺陷位置不同时的剪切带图案启动、演变及试样的宏观力学行为。在数值计算中,采用了莫尔-库仑与拉破坏复合的破坏准则,峰后岩石的本构关系为线性应变软化。当试样左、右边界上的缺陷距离较远时,剪切带仅出现1条,以通过两缺陷形式贯通试样两边界;当两缺陷距离较近时,启动于缺陷附近的剪切带按各自其固有方向发展,剪切带图案十分复杂。当右缺陷距离试样上端面较近时,由于上端面的约束,仅位于缺陷下方的剪切带能得到充分的发展。若剪切带数量较少且贯通试样两边界时,试样发生脆性剪切破坏,应力-变形曲线软化段比较陡峭;反之,发生韧性剪切破坏,软化段比较平缓。当剪切带的前端迎面遇到试样上、下端面附近的上、下三角形区域时,由于端面的约束,剪切带的方向将改变。当剪切带的前端与试样的纵向对称线距离较近时,剪切带发生折射现象;当距离较远时,剪切带将发生反射现象。

Strain localization and macroscopically mechanical behaviors of rock specimen with and without material imperfection in plane strain compression were modeled numerically by FLAC.The adopted failure criterion was a composite Mohr-Coulomb criterion with tension cut-off and the post-peak constitutive relation of rock was linear strain-softening.For ideal specimen without any material imperfection,the deformation of the specimen is symmetrical with respect to the vertical axis of the specimen.If an imperfection...

Strain localization and macroscopically mechanical behaviors of rock specimen with and without material imperfection in plane strain compression were modeled numerically by FLAC.The adopted failure criterion was a composite Mohr-Coulomb criterion with tension cut-off and the post-peak constitutive relation of rock was linear strain-softening.For ideal specimen without any material imperfection,the deformation of the specimen is symmetrical with respect to the vertical axis of the specimen.If an imperfection is introduced in the form of a null element at one lateral edge,then the deformation no longer remains symmetrical.Shear strain localization is mainly initiated in the vicinity of the imperfection.For imperfect specimen,the onset of strain localization is earlier than that of ideal specimen.When the imperfection approaches to the middle of left edge of the specimen,multiple shear bands are formed so that the relatively ductile shear failure modes are expected and the post-peak stress-axial deformation curve and stress-lateral strain curve of the specimen tend to be less brittle.If the imperfection is closer to the top and base of the specimen,only a shear band is formed,going through the two lateral edges of the specimen,and the macroscopically mechanical behaviors of the specimen tend to be more brittle at post-peak.Migration or jump of shear band and competition between the two shear bands are observed.For ideal specimen,the peak strength is higher than those of imperfect specimens.When the imperfection moves away from the fixed end(base of the specimen),the peak strength decreases and finally approaches to a constant.

在平面应变压缩条件下,采用拉格朗日元法研究了材料缺陷对岩样应变局部化及宏观力学行为的影响。在数值计算中,采用了莫尔-库仑与拉破坏复合的破坏准则,峰后岩石的本构关系为线性应变软化。对于理想岩样(不含任何缺陷),从剪切应变率的等值线图及变形网格图发现,变形场相对试样垂直对称轴对称。在试样的边界上设置材料缺陷后,变形场的对称性被打破。材料缺陷附近是局部化现象启动的主要位置。与不含材料缺陷试样相比,含缺陷试样的局部化提前启动。当缺陷位于试样左边界中部附近时,试样内部出现多条剪切带,发生韧性剪切破坏,峰后应力-轴向应变曲线和应力-侧向应变曲线均倾向于韧性,岩样的稳定性增强;当缺陷位于试样上、下端面附近时,仅出现一条贯穿试样左右边界的剪切带,发生脆性剪切破坏,峰后两种曲线倾向于脆性,易发生失稳破坏。从数值结果中还观测到了剪切带的跳跃或迁移现象及剪切带的相互竞争、此消彼涨的现象。当岩样中不包含任何缺陷时,试样应力-变形曲线的峰值强度最高。随着缺陷的上移,峰值强度下降,直到峰值强度基本保持不变。缺陷越接近于岩样的下端,对岩样应力-变形曲线的峰值强度的影响越小。

 
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