MECHANISMS OF RUPTURE IN SPLITTING TESTS
MECHANISMS OF RUPTURE IN SPLITTING TESTS
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DOI：
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发表时间：
1999
影响因子：
1.7
通讯作者：
C. Rocco;G. Guinea;J. Planas;M. Elices
中科院分区：
文献类型：
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作者：
C. Rocco;G. Guinea;J. Planas;M. Elices
对劈拉试验（巴西试验）中的断裂机理进行了试验研究，特别注意了支承条宽度的影响。在砂浆方柱和花岗岩圆盘上进行了扩大尺寸范围（1：10）的试验。在闭环控制系统上进行试验，以获得稳定的裂纹扩展。在测试过程中，记录了裂纹的萌生和扩展。结果证实了在劈裂试验中存在两种断裂机制：一种与中心裂纹的发展有关，另一种与支承条两侧的二次裂纹系统有关。这些二次裂纹的出现是由于中心裂纹扩展引起的应力重分布的结果。在稳定测试期间记录的载荷-位移曲线表明存在两个峰值载荷，每个机构一个。这些峰值载荷的相对值取决于试样尺寸和承载带的宽度：尺寸越小，承载带越宽，与二次裂纹系统相关的峰值载荷的相对值越大。
The fracture mechanisms in the splitting tensile test (Brazilian test) are studied experimentally with special attention given to the influence of the width of the bearing strips. Tests of an extended size range (1:10) were conducted on mortar square prisms and granite discs. The tests were carried out on a closed-loop control system to obtain stable crack propagation. During the tests, crack initiation and propagation were recorded. The results confirm the existence of two fracture mechanisms in the splitting test: one associated with development of central cracks and the other with a secondary crack system on both sides of the bearing strips. These secondary cracks appear as a consequence of the stress redistribution induced by the central crack growth. The load-displacement curves recorded during the stable test show that two peak loads exist, one for each mechanism. The relative values of these peak loads depend on the specimen size and the width of the bearing strip: with a smaller size and a wider bearing strip, the relative value of the peak load associated with the secondary crack system increases.