摘要
研究了静载拉伸过程中三种规格45钢轴状试件表面法向磁场强度Hp(y)值的变化规律,并对Hp(y)曲线斜率的绝对值|k|与拉应力σ之间的对应关系进行了分析。结果表明:试件规格相同时,|k|-σ的对应关系相同,即弹性范围内,|k|随σ的增加而增大;加载至屈服极限附近时,|k|出现最大值;进入塑性变形阶段后,|k|出现减小的趋势;拉断后,Hp(y)曲线在断口附近发生折转,并在断口两侧出现峰值。试件规格不同时,受载区域长度对|k|-σ关系影响显著,即所受拉应力相同,受载区域的长度增大,|k|减小。
The variations of the magnetic intensity, Hp（y）, on the direction perpendicular to the surface of 45 carbon steel tensile specimens with shaft-shaped geometry and three different dimensions were determined during the static tension testing by using the metal magnetic memory. The relationship between the tension stress σ and the absolute value of slope of Hp（y） curve ｜k｜ was investigated. In the full elastic range, experimental results showed that, when the dimension of the specimens was given, the magnitude of ｜k｜ increased with increasing the loading magnitude. However, near the yield limit in the plastic range, the slope reached a local maximum and then decreased. After abruption, an abrupt change in Hp（y） curve occurred near the fracture surface. When the dimensions of the specimens were different, the relationship between σ and ｜k｜ was significantly influenced by the length of the specimens. Results showed that with increasing of the specimen length, the magnitude of ｜k｜ decreased.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2008年第8期77-80,共4页
Journal of Materials Engineering
基金
国家自然科学基金项目(50505052)
再制造重点实验室基金项目(9140C85010106JS9101)
国家自然科学基金重点项目(50735006)
关键词
金属磁记忆
静载拉伸
磁场强度
斜率
多规格
metal magnetic memory
static tension
magnetic intensity
slope
dimension
