Damage of marble from cyclic loading
Damage of marble from cyclic loading
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DOI：
10.1061/(asce)0899-1561(2001)13:6(459
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发表时间：
2001-12
影响因子：
3.2
通讯作者：
S. Cattaneo;J. Labuz
中科院分区：
文献类型：
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作者：
S. Cattaneo;J. Labuz
研究了大理岩在循环荷载作用下的损伤和破坏机理。在三点和四点弯曲中，对梁施加约100个循环的递增载荷步骤，代表低周疲劳。通过应变仪阵列和干涉测量技术记录了损坏情况，该技术提供了对表面变形的全场评估。结果表明，大理石梁中的大应变产生永久变形，在循环载荷下，以不可逆的方式收集方解石颗粒的逐渐松动。单调加载和循环加载下的试样的破坏表面在视觉上是不同的，在循环加载的试样的宏观断口被粉末覆盖，揭示了脱粘过程。在梁的底部测量永久伸长率，而在顶部出现缩短。这种永久变形是在风化损坏的薄大理石覆层中观察到的弯曲型行为的特征。
The behavior of marble was investigated to evaluate the damage and failure mechanisms produced from cyclic loading. Approximately 100 cycles of increasing load steps, representing low cycle fatigue, were imposed on beams in three and four-point bending. Damage was recorded through an array of strain gauges and an interferometric technique that provided a full-field assessment of the surface deformation. It was shown that large strains in the marble beams created permanent deformations that, with cyclic loading, collected in an irreversible way with a progressive loosening of the calcite grains. The failure surfaces of the specimens under monotonic and cyclic loading were visually different in that macroscopic fracture of cyclically loaded specimens were covered with powder, revealing the decohesion process. Permanent elongation was measured at the bottom of the beams, while shortening appeared at the top. This permanent deformation is characteristic of a bowing type of behavior that has been observed in thin marble cladding damaged from weathering.