摘要
在曲率较大的柱形或球形凸、凹接触界面之间的压力测量过程中,一般会将测试前呈平直薄片的柔性传感器敏感元压至与被测表面面型一致,这样就会因敏感元自身面型变化而引入测量误差。这是这类接触界面压力测量传感器研制中必须关注的问题。针对这一背景,以圆柱形接触界面为例,采用作者以前建立的含柔性泡沫元件组合结构的近似数值分析方法,建立凸圆柱面-柔性压磁材料薄片-凹圆柱面的有限元模型,通过数值模拟和相应实验,得到了不同曲率圆柱面加载下柔性压磁敏感材料薄片所受轴向压缩应力与轴向压缩应变之间的关系。结果表明,加载面曲率越小,应力-应变曲线的近似线性段的斜率就越大,在加载面曲率半径大于20 mm时,其影响基本可以忽略。该结果对于将柔性压磁敏感材料薄片作为敏感元开发大曲率柱形或球形接触界面之间的压力测量传感器具有理论指导意义。
In measurement of interlayer stress between cylindrical or spherical contact convex-concave interfaces with related big curvature, the fiat sensitive element will be curved to the form of the measured contact surfaces, which can cause measurement errors. This issue must be considered in developing sensors applied to measuring such kind of contact interfaces stress. For this application background and taking the cylindrical contact interfaces issue as an example, a finite element model consisting of a loading part with a convex cylindrical surface, a soft piezomagnetic sensitive material sheet, and a fixed part with a concave cylindrical surface is developed by using the approximate numerical method for analyzing combined structure with soft foam parts suggested previously by the author. Through numerical computation and related experiment, the axial compressive stress-strain curves of the sheets are obtained for several different curvatures of the loading surfaces and the effects of curvature on mechanical behaviors of piezomagnetic material sheets were analyzed. It is indicated that the bigger the curvature radius of the loading surface is, the bigger the slope of the approximate linear segment of the axial stress-strain curve is. The result is useful for development of sensors for measurement of interlayer pressurized force between cylindrical or spherical contact interfaces with related big curvature.
作者
尹益辉
吴菊英
王沪毅
高洋
YIN YiHui WU JuYing WANG FuYi GAO Yang(Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900, China)
出处
《机械强度》
CAS
CSCD
北大核心
2016年第5期1016-1020,共5页
Journal of Mechanical Strength
基金
中国工程物理研究院重点学科项目"计算固体力学"
中国工程物理研究院科学技术发展基金重点项目(2010A0301014)资助~~
关键词
接触界面曲率
柔性压磁敏感材料
力学特性
传感器敏感元
柱面形接触界面压力传感器
Contact surface curvature
Soft piezomagnetic sensitive material
Mechanical properties
Sensitiveelement of sensor
Cylindrical contact interfaces pressure sensor
