| 引用本文: | 杨光松,金星,陆寅初.梁的蠕变脆性各向同性弯曲损伤模型.[J].国防科技大学学报,1995,17(1):71-80.[点击复制] |
| Yang Guangsong,Jin Xing,Lu Yinchu.A Creep Bending Damage Model on Beams[J].Journal of National University of Defense Technology,1995,17(1):71-80[点击复制] |
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| 梁的蠕变脆性各向同性弯曲损伤模型 |
| 杨光松, 金星, 陆寅初 |
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(国防科技大学 航天技术系 湖南 长沙 410073)
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| 摘要: |
| 本文在梁的纯弯曲损伤基本假设条件下，导出了弯曲损伤的基本方程，与Kachanov 的材料刚度劣化(受载横截面积减小)定义拉伸损伤变量类似，以梁的弯曲刚度劣化(惯性矩减小)定义弯曲损伤变量，从而建立了与 Kachanov 拉伸损伤模型相类似的梁的各向同性弯曲损伤模型。最后，以受蠕变纯弯曲梁为实例进行了损伤分析，在一次近似条件下，该弯曲损伤模型的材料常数可由 Kachanov 拉伸损伤模型的材料常数确定，且所得计算结果与 Kachanov 拉伸损伤模型所得结果比较吻和，表明该弯曲损伤模型是合理适用的。 |
| 关键词: 纯弯曲梁，蠕变，拉伸损伤，弯曲损伤，各向同性损伤模型 |
| DOI： |
| 投稿日期：1994-03-25 |
| 基金项目: |
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| A Creep Bending Damage Model on Beams |
| Yang Guangsong, Jin Xing, Lu Yinchu |
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(Department of Astrautics)
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| Abstract: |
| In this paper, based on the basic assumptions of pure bending damage of beams, the elementary equations are drived, in which the definition of bending damage variable is defined by reduction of moment of inertia similar to that of tensile damage variable defined by reduction of loading area, a simple bending damage model is proposed similar to kachanov's tensile damage model. As an example, a bending damage analysis of a beam for creep pure bending is made, the material's constants of the simple bending damage model can be determined in first approximation to kachanov's tensile damage model，the calculating results are compared in good agreement with the results obtained by kachanov's tensile damage model. It shows that the bending damage model is reasonable. |
| Keywords: pure bending beams, creep,tensile damage,bending damage |
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