Modelling of Deformation Behavior of Mesoscopic Scale of Materials and Its Application to Design of Functional Materia

材料细观尺度变形行为建模及其在功能材料设计中的应用

• 批准号: 07455053
• 负责人: TOMITA Yoshihiro
• 金额: $ 4.86万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455053/
• 关键词: Mesoscale; Strain-induced martensitic phase transformation; TRIP; Functional material; FEM; Micro hardness; メゾ・スケールモデル; 変形誘起変態; ポリマー; 高分子鎖; 内部構造変化; 構成モデル; シミュレーション

A TRIP (transformation-induced plasticity) steel possesses such desirable mechanical properties as high strength, ductility and toughness due to the effect of strain-induced martensitic transformation. However such properties are achieved only under certain restricted conditions since the transformation strongly depends on temperature, applied strain and strain rate as well as their history. The transformation mechanism contrbiuting to the local deformation may be difficult to comprehend full based on any experimental methods. Numerical simulations with more appropriate constitutive equation are, therefore, indispensable.In this study, uniaxial tension tests at several environmental temperatures are carried out to fit the material parameters defined in the constitutive equation. Elastic-viscoplastic finite-element simulations nsing the constitutive equation are performed and the volume fraction of martensite phase measured by using a micro hardness testing is utilized to elucidate the validity of the proposed constitutive equation in the analysis of nonuniform deformation behavior. Then the deformation behavior and the toughuess improvememt mechanism associated with strain-induced martensitic trans-formations around notch tip has been clarified.Around the room temperature, the reduction of phase transformation rate due to decreasing of driving force with temperature rising prevents the excessive transformation around the notch tip which suppress the stress concentration as compared with that at the low teperature range. As a result, occurance of cracking is substantially delayd, which yields the improvement of the toughness.

由于应变诱导的马氏体转化的影响，Trip（转化引起的可塑性）钢具有高强度，延展性和韧性等理想的机械性能。但是，这种特性仅在某些限制条件下才能实现，因为转化很大程度上取决于温度，施加的应变和应变速率及其病史。基于任何实验方法，对局部变形的转化机制可能很难完全理解。因此，具有更合适的本构方程的数值模拟是必不可少的。在这项研究中，在几个环境温度下进行单轴张力测试，以适合本构方程中定义的材料参数。 Elastic-viscoplastic finite-element simulations nsing the constitutive equation are performed and the volume fraction of martensite phase measured by using a micro hardness testing is utilized to elucidate the validity of the proposed constitutive equation in the analysis of nonuniform deformation behavior.然后，已经澄清了与应变诱导的马塞环式转换相关的变形行为以及与应变诱导的尖端上的骨膜转换相关的强度改善机制。室温，由于温度升高而导致驱动力降低而导致的相变速率的降低可阻止围绕缺口浓度过度转化，从而抑制低纤维范围内的槽口浓度。结果，破裂的发生基本上是延迟的，从而提高了韧性。

项目成果

Yoshihiro Tomita Takeshi Iwamoto: "Constitutive modeling of TRIP steel and its application to the improvement of mechanical properties" Int. J. Mech. Sci.37. 1295-1305 (1995)

Yoshihiro Tomita Takeshi Iwamoto：“TRIP钢的本构建模及其在改善机械性能方面的应用”Int。

渋谷陽二 谷山彰紀: "冨田佳宏 安達泰治" 微小硬度を用いた局所的ひずみ誘起マルテンサイト変態特性の測定. 材料(日本材料学会誌). 1997 ((掲載予定))

Yoji Shibuya，Akinori Taniyama：“Yoshihiro Tomita，Yasuharu Adachi”使用显微硬度测量局部应变诱导的马氏体转变特性（日本材料学会杂志，1997 年）（（待出版））。

Y.Tomita & T.Iwamoto: "Constitutive modeling of TRIP steel and its application" Advances in Engng.Platicity and Its Application (X.Bingye & Y.Wei eds.). 413-422 (1995)

富田Y

T. Ogawa, A. Taniyama, Y. Tomita & Y. Shibutani: "Local deformation behavior around ringed notch TRIP steel bars under tension" Proc. of AEPA ′96, (Elsevier Scie. Pub. ). 599-603 (1996)

T. Okawa、A. Taniyama、Y. Tomita 和 Y. Shibutani：“张力下环槽 TRIP 钢筋周围的局部变形行为”Proc. of AEPA 96，（Elsevier Scie. Pub. 599-603）。

Y.Tomita & T.Iwamoto: "Constitutive Modeling of TRIP Steel and its Application to the Improvement of Mechanical Properties" Int.J.Mech.Sci. 37・12. 1295-1305 (1995)

Y.Tomita 和 T.Iwamoto：“TRIP 钢的本构模型及其在改善机械性能中的应用”Int.J.Mech.Sci 37・12（1995）。