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首页> 外文会议>Proceedings of Third International Symposium on Wood Machining >EXPERIMENTAL DETERMINATION OF STRAIN FIELD IN CT-SPECIMENS DURING CRACK PROPAGATION
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EXPERIMENTAL DETERMINATION OF STRAIN FIELD IN CT-SPECIMENS DURING CRACK PROPAGATION

机译：CT试样裂纹扩展过程中应变场的实验测定

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摘要

The quasi-brittle fracture behaviour of Scots pine (Pinus Sylvestris) is studied. The compact tension test (CTT), is used to produce stable crack growth, and in turn to obtain a softening branch. Corresponding values of the applied load and the crack mouth opening displacement (CMOD) are recorded. Furthermore a number of digital images are captured, before and during loading of the CT-specimens by a photogrammetric equipment. With the equipment displacement and strain fields for the specimens were calculated, hence strain fields were established at different load levels. Furthermore the influence of sharpness of the notch is examined. Two types of notches are examined, one made by a saw blade and one made by a razor blade. The results indicate that the fictitious crack model is suitable for modeling Mode I crack propagation in the TL plane.
机译：研究了苏格兰松（Pinus Sylvestris）的准脆性断裂行为。紧密拉伸试验（CTT）用于产生稳定的裂纹扩展，进而获得软化分支。记录相应的施加载荷值和裂口张开位移（CMOD）。此外，在由摄影测量设备加载CT样本之前和期间，捕获了许多数字图像。借助设备，计算了试样的位移和应变场，因此建立了在不同载荷水平下的应变场。此外，检查了切口的清晰度的影响。检查了两种类型的槽口，一种由锯片制成，另一种由剃须刀制成。结果表明，虚拟裂纹模型适用于模拟TL平面中的模式I裂纹扩展。

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