Uncertainty-quantified parametrically homogenized constitutive models (UQ-PHCMs) for dual-phase α/β titanium alloys

作     者：Shravan Kotha Deniz Ozturk Somnath Ghosh 

作者机构：Departments of CivilMechanical and Materials Science&EngineeringJohns Hopkins University3400 N.Charles StreetBaltimoreMD 21218USA 

出 版 物：《npj Computational Materials》 (计算材料学（英文）)

年 卷 期：2020年第6卷第1期

页      面：677-696页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：This work has been partially supported through a subcontract to JHU(sub-recipient)from the Ohio State University through a sub-award No.60038238 from an AFRL grant No.FA8650-13-2-2347 as a part of the AFRL Collaborative Center of Structural Sciences The work has also been supported by the Air Force Office of Scientific Research Structural Mechanics and Prognosis Program through Grant No.FA-RT1645(Program Manager:Dr.J.Tiley). 

主　　题：alloys deformation constitutive 

摘      要：This paper develops an uncertainty-quantified parametrically homogenized constitutive model(UQ-PHCM)for dual-phase α/βtitanium alloys such as Ti6242S.Their microstructures are characterized by primaryα-grains consisting of hcp crystals and transformedβ-grains consisting of alternating laths ofα(hcp)and β(bcc)phases.The PHCMs bridge length-scales through explicit microstructural representation in structure-scale constitutive models.The forms of equations are chosen to reflect fundamental deformation characteristics such as anisotropy,length-scale dependent flow stresses,tension-compression asymmetry,strain-rate dependency,and cyclic hardening under reversed loading conditions.Constitutive coefficients are functions of representative aggregated microstructural parameters or RAMPs that represent distributions of crystallographic orientation and morphology.