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Equibiaxial Ilexural strength testing of fiber-reinforced ceramics

机译：纤维增强陶瓷的等双轴抗弯强度测试

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In my last column, I discussed uniaxial flexural strength testing of fiber-reinforced ceramics, that is, simple three- or four-point bending of a strip of material of rectangular cross section (see "Learn More," p. 11). As was noted, the strength of this test specimen is sensitive to machining defects at its edges. Also, in many applications of fiber-reinforced ceramics (and unreinforced ceramics), the stress state is not uniaxial, but rather biaxial. Based on these considerations, biaxial flexural tests have been developed, at least two of which have become commonly used ASTM and ISO standards. One of the two is ASTMG 1499, introduced in 2001 and currently the primary ASTM standard for biaxial testing. In the ASTM G 1499 test method, a thin circular disk (the standard also permits the use of a thin square plate) is supported on a ring and loaded by a ring of smaller diameter. For that reason, it is commonly referred to as a ring-on-ring test. The goal is to induce a biaxial failure stress away from the edges of the specimen that can be calculated using simple, small-deflection plate theory.
机译：在上一专栏中，我讨论了纤维增强陶瓷的单轴抗弯强度测试，即，对矩形横截面材料条的简单三点或四点弯曲（请参阅第11页的“了解更多信息”）。如前所述，该试样的强度对其边缘处的加工缺陷敏感。同样，在纤维增强陶瓷（和非增强陶瓷）的许多应用中，应力状态不是单轴的，而是双轴的。基于这些考虑，已经开发了双轴弯曲试验，其中至少两个已成为常用的ASTM和ISO标准。两者之一是ASTMG 1499，它于2001年推出，目前是双轴测试的主要ASTM标准。在ASTM G 1499测试方法中，薄的圆盘（该标准还允许使用薄的正方形板）支撑在一个环上，并由直径较小的环加载。因此，通常将其称为“环上环测试”。目的是使远离试样边缘的双轴破坏应力产生，可以使用简单的小挠度板理论来计算。

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