Composite Material For Embedded Sma Wire In The Temperature Under The Influence Of One-dimensional Force Analysis,

Shape memory alloy (SMA) is a kind of functional material with special characteristics and behavior such as shape memory effect, variable stiffness and pseudo elasticity. Due to these characteristics, SMA has obtained such a wide ultimate value and good development in astronavigation aviation navigation electron mechanics light industry medical and health work that it is called "the material of 21st century"The active detecting and the active control of crack and damnification are the most outstanding and exigent questions need to be solved in the practice engineering. So it is urgent that the research which uses shape memory alloy (SMA) to the control of the crack's birth and growth.In this paper, the special characteristics of shape memory alloy (SMA) are particularly introduced at first. Secondly, the microcosmic mechanism of these characteristics are summarized and then the variety constitutive relationship models brought forward by the former are introduced, on these bases. the constitutive relationship model is educed when SMA is embedded in the inside of component. The Shape memory alloy (SMA) has many unique characteristics and behavior, for instance, they have larger electric resistivity and higher sensitivity to strains, and will produce a large recovery force when heated, etc. Therefore the questions are discussed that the SMA is used to detect crack and control the crack growth actively when the SMA is embedded in the component. The theory and numerical analysis which are used to the active detecting and the active control of crack are particularly explained, and the numerical results are educed when the SMA is powered, which contain the stress on the tip of the crack, the strain field and the variety of stress intensity factor on the tip of the crack. Accordingly, the feasibility of using shape memory alloy (SMA) to actively control the growth of the crack is testified, and the effect is remarkable. Meanwhile, the influence effect is given between the different position where the SMA is fitted and the stress intensity factor on the tip of the crack. The conclusions of this research provide reference for the farther research of using shape memory alloy (SMA) to control the crack growth.This paper obtained the assistance of the sub- item "the mechanics performance research of late-model Shape Memory Alloy (SMA) material" (NO:90205007) which is contained in the great research project of The China National Science Foundation "the series of great basic questions of outer space aero craft"...