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疲劳损伤过程的热能耗散分析

童小燕 , 王德俊 , 徐灏

金属学报

利用能量作疲劳损伤基本参量,建立了疲劳损伤的能耗结构,在试验的基础上,围绕着疲劳损伤过程中的不可逆能耗分析,系统地研究了循环过程及循环内的疲劳损伤热能耗散变化规律,并寻找出疲劳过程中循环滞回能与有效能耗(储能)之间联系。

关键词: 疲劳损伤 , energy dissipation , cycle loading process , null

Energetical Theories on Fatigue Life Prediction

TONG Xiaoyan ** Aircraft Engineering Department , Northwestern Polytechnical University , Xi'an , 710072 , China

材料科学技术（英）

Current developments on fatigue life prediction methods have been systematically reviewed.In con- sideration of the irreversibility of energy dissipation during fatigue damage process,the main contents for fatigue damage estimation and localized equivalence as well as simulation models have been established.A frame of energy-based fatigue life prediction method has been proposed,meanwhile, the procedure in application to a practical structure component has been described.

关键词: energy dissipation , null , null , null

水平低周反复荷载作用下棉花秸秆草砖填充墙对框架结构抗震性能的影响

冯勇 , 付彬彬 , 晋强 , 史阳光

材料科学与工程学报 doi:10.14136/j.cnki.issn 1673-2812.2016.05.016

本文分别对按1/2比例制作的1榀内填棉花秸秆草砖的框架结构墙体和1榀纯混凝土框架进行水平低周反复荷载作用下的抗震性能试验,研究棉花秸秆草砖填充墙对框架结构的承载能力、刚度、延性、耗能等抗震性能的影响,试验结果表明棉花秸秆草砖与外框的黏结性能能减缓墙体的破坏速度,两者黏结性能破坏时,草砖也未退出工作仍能与外框共同抵抗外力作用;草砖的弹性模量小,因此墙体的滞回曲线比纯框架墙体“捏拢”现象更明显;草砖能增强框架结构的延性和耗能性能并有效提高墙体刚度.

关键词: 棉花秸秆草砖 , 水平低周反复荷载 , 抗震性能 , 承载力 , 滞回曲线 , 延性 , 刚度 , 耗能

HEAT ENERGY DISSIPATION IN FATIGUE DAMAGE PROCESS

TUNG Xiaoyan Northwestern Polytechnical University , Xi'an , ChinaWANG Dejun XU Hao Northeast University of Technology , Shenyang , China

金属学报(英文版)

Using the dissipated energy as an essential parameter,the energy dissipative structure in pro- cess of fatigue damage of materials has been established.Through thermodynamic analysis for irreversible energy dissipation in fatigue damage process,the heat dissipative variations in cyclic loading process as well as in a cycle have been systematically studied on the basis of low cycle fatigue tests and infrared measurement of self-heating thermography.Meanwhile,the cyclic hysteresis energy and efficient energy dissipation (stored energy) have been proposed during fatigue damage process.

关键词: fatigue damage , null , null

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