摘要
根据声发射数和应力水平关系,进一步分析推导出了声发射概率密度的函数表达式,并通过对混凝土进行单轴压缩室内声发射试验研究,应用声发射概率密度函数分析比较了材料在不同应力水平下的破坏程度.通过引入损伤变量新算法即损伤变量大小为声发射概率曲线下方包围面积大小,在以声发射数为中间变量的基础上推导出近似梯形积分公式,直接建立起损伤变量与声发射数之间的函数关系;并通过对各试验曲线拟合得出损伤变量和声发射数之间满足线性关系.
In this paper, we analyzed the function expression of the acoustic emission （AE） probability density function based on the relationship between AE count and the stress percent. With the laboratory uniaxial compression AE experiment of concrete,the materials＇ damage extent at various stress percents were analyzed and compared by appling the AE probability density function..The new computational method of damage parameter was defined,which was the area below the curve of the AE probability density funetion. The trapezoid area formula was derived with the intermediate AE count. The function relationship between the damage parameter and AE count was established directly. The result of the experiment curves based on the experiment showed that the damage parameter and AE count satisfies linear relationship.
出处
《厦门大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第4期526-530,共5页
Journal of Xiamen University：Natural Science
基金
国家自然科学基金(10572122)
关键词
混凝土
力学参数
声发射参数
声发射概率密度
损伤变量
concrete
mechanics parameter
acoustic emission parameter
acoustic emission probability density
damage parameter
