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recrystallization leads flow stress value decreasing gradually. A group of coefficients needed by the phenomenological constitutive model containing a softening ratio item were calculated by the multiple... and work-hardening higher. The phenomenological constitutive description of 7075 aluminum alloy can accurately describe the relationships among flow stress, temperature, strain rate, strain and dynamic......
that limestone displayed hard rock creep properties. Fig. 2 Creep test curve under a 30 MPa confining pressure 2.2 Nonlinear creep damage constitutive model The relationship of creep strain, deviatoric... limestone tests to study nonlinear creep damage characteristics of surrounding rock mass in construction projects. We established a nonlinear creep damage constitutive model for the rock mass, as well......
properties. Key words: 7005 alloy; hot compression deformation; constitutive equation; processing map 1 Introduction In view of their high specific strength and excellent mechanical properties, 7000 series... of the present work is to analyze the flow stress behavior in terms of strain rate and deformation temperature sensitivities, develop constitutive equation to describe the dependence of the flow stress on strain......
Trans. Nonferrous Met. Soc. China 23(2013) 1428-1434 Constitutive model for thin sheet metal with one or several grains across thickness in micro-forming Qian WANG1, Xiang-huai DONG1, Hai-ming ZHANG1... that when t/d ratio is larger than a critical value, effect of t/d ratio on flow stress can be neglected. Existence of critical t/d ratio changes the Hall-Petch relationship and evolution of flow......
at different strain rates 3.2 Constitutive equations and material constants The Arrhenius equation is widely used to describe the relationship among the strain rate, flow stress and temperature... Y. Modeling constitutive relationship of Ti17 titanium alloy with lamellar starting microstructure [J]. Mater Sci Eng A, 2012, 538: 182-189. [22] PENG W, ZENG W, WANG Q, YU H. Comparative study......
-strain relationship of specimens after freeze-thaw cycles was measured. On the basis of damage model of concrete under uniaxial compression, the constitutive model of damage was founded according...; 文章编号:1672-7207(2013)01-0340-05 Constitutive model of damage of concrete under biaxial compression SHANG Huaishuai1, 2, YANG Lusheng3 (1. School of Civil......
analysis, and thus the relationship between flow stress and deformation conditions can be achieved. Key words: ultrahigh strength steel BR1500HS; dynamic recovery; parameter Z; constitutive model 近年来,随着世...:A 文章编号:1672-7207(2016)04-1111-10 A constitutive model for ultrahigh strength steel BR1500HS and its validation XIA Yufeng, JI Shuai, ZHANG Yandong......
in other conditions, showing dynamic recrystallization. A hyperbolic sine relationship is found to correlate well the flow stress with the strain rate, and an Arrhenius relationship with the temperature. The strain hardening coefficient n and deformation activation energy Q are evaluated by linear regression analysis. And the flow stress constitutive equation of the alloy during hot compression......
during the past two decades on constitutive relationship for rocks [1-8]. Under the external loads, the deformation characteristics of rocks, such as the initial state of compaction and the latter... be taken into account with relation to the development of constitutive model. Firstly, rocks are divided into three parts, i.e., voids, a damaged part and an undamaged part in the course of loading......
condition. 3.2. Constitutive equation The hyperbolic sine-type equation has been extensively employed to characterize the relationship among flow stress (σ), temperature (T) and strain rate () in a broad... recrystallization behaviors of Mg-5Gd-4Y-0.5Zn- 0.5Zr alloy [J]. Materials Science and Engineering A, 2008, 485: 487-491. [14] ZHOU Z, FAN Q, XIA Z, HAO A, YANG W, JI W, CAO H. Constitutive relationship and hot......