CAJ | 학술논문

球形压痕技术在材料力学属性,诸如硬度,弹性模量等的测量中得到了广泛的应用.应用Twyman-Green及云纹干涉法并配合相移技术,本文对IN783合金进行了一系列的球形压痕实验研究,并对残余压痕的面内(u, v)及离面(w)变形场进行了定量测量和分析.应用面内变形测量结果,进一步对试件表面的应力-应变分布进行了分析和计算,并在离面变形场的基础上,确立了压痕周围的弹塑性边界,从而进一步应用面内的分析结果,得到材料的屈服强度.应用压痕实验的接触半径和压力并配合Tabor经验公式,本文进一步得到了材料的应力应变曲线.实验结果与已知的IN783合金相吻合.对所涉及的一系列压痕实验,本文也进行了二维有限元分析并得到了比较一致的结果.
구형압흔기술재재료역학속성,제여경도,탄성모량등적측량중득도료엄범적응용.응용Twyman-Green급운문간섭법병배합상이기술,본문대IN783합금진행료일계렬적구형압흔실험연구,병대잔여압흔적면내(u, v)급리면(w)변형장진행료정량측량화분석.응용면내변형측량결과,진일보대시건표면적응력-응변분포진행료분석화계산,병재리면변형장적기출상,학립료압흔주위적탄소성변계,종이진일보응용면내적분석결과,득도재료적굴복강도.응용압흔실험적접촉반경화압력병배합Tabor경험공식,본문진일보득도료재료적응력응변곡선.실험결과여이지적IN783합금상문합.대소섭급적일계렬압흔실험,본문야진행료이유유한원분석병득도료비교일치적결과.
Spherical indentation technique was widely used for material mechanical property evaluation, such as hardness, elastic modulus etc. Using this technique, a series of residual surface deformation analyses was conducted on IN783 alloy to evaluate the material mechanical properties. Both of the residual in-plane (u, v) and out-of-plane (w) displacements were measured using a combined phase-shifting Twyman-Green and moiré interferometry. Based on the measured in-plane displacements, the surface stress-strain distribution was then analyzed. The elastic-plastic boundary was determined based on the measured out-of-plane displacements and material yield strength was obtained based on the measured in-plane displacements. Furthermore, the measured contact radii and applied loads were used to establish a post-yielding stress-strain relationship using Tabor's empirical relation. The results matched well with the known IN783 mechanical properties. Detailed 2D finite element analyses were also conducted for each loading case to study the characteristics of the residual surface deformation. The numerical results confirmed the observation from the experimental tests.