锻压技术

樟子松压缩过程中的力学性能及裂纹扩展

英文标题：Mechanical properties and crack propagation for camphor pine during compression process

作者：李震陶鑫赵召才孙恒阳雷曌

关键词：樟子松缺陷顺纹压缩极限载荷裂纹

分类号：TK6

出版年,卷(期):页码：2024,49(11):87-93

摘要：

为了分析不同缺陷樟子松在压缩过程中的力学性能及裂纹扩展情况，在实际压缩试验的基础上，建立了樟子松ABAQUS仿真模型。研究表明，无缺陷的樟子松试样在50.60 s时达到极限载荷26.70 kN，缺陷大小为Φ4、Φ6、Φ8和Φ10 mm时樟子松试样的极限载荷分别为17.53、15.63、11.81和10.49 kN。为了预测樟子松在压缩过程中的裂纹情况以及力学性能，在ABAQUS中建立木材本构模型模拟樟子松试样的压缩过程，仿真结果可以很好地反映试样的裂纹情况，并且无缺陷试样极限载荷的仿真值与试验数据的绝对误差不超过0.2 kN，验证了本构模型的有效性。通过试验与仿真相结合的方法，在已知缺陷大小的情况下很好地预测樟子松压缩过程中的裂纹扩展情况和极限载荷，提高在役木材检测的效率。

In order to analyze the mechanical properties and crack propagation of camphor pine with different defects during the compression process, an ABAQUS simulation model of camphor pine was established on the basis of actual compression test. The research results show that the ultimate load of the camphor pine specimen without defects reaches 26.70 kN at 50.60 s, and the ultimate loads of the specimens with the defect size of Φ4, Φ6, Φ8 and Φ10 mm are 17.53, 15.63, 11.81 and 10.49 kN, respectively. In order to predict the crack condition and the mechanical properties of camphor pine in the compression process, a wood constitutive model was established in ABAQUS to simulate the compression process of camphor pine specimen, and the results of simulation can well reflect the crack condition of specimen, and the absolute error of ultimate load between the simulation values and the test data of the specimens with out defects does not exceed 0.2 kN, which verifies the validity of the constitutive model. By combining test and simulation, the crack propagation condition and the ultimate load of camphor pine with known defect sizes during the compression process can be well predicted, which improves the inspection efficiency of in-service wood.

基金项目：

国家自然科学基金资助项目(52366018);内蒙古自治区自然科学基金资助项目(2020LH05020)

作者简介：李震（1973-），男，博士，教授 E-mail：lizhen_730106@126.com 通信作者：陶鑫（1998-），男，硕士研究生 E-mail：1848932887@qq.com

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