高延性金属阻尼材料大塑性本构关系研究
发布时间：2018-12-27 16:03
【摘要】：软钢阻尼器是一种新一代可被广泛应用于耗能减震结构体系的利用软钢材料塑性变形来实现阻尼功能的结构部件,具有稳定可靠的工作性能和良好的耗能能力。软钢极低的屈服点可以保证阻尼器在建筑等主体结构在受到地震等外界载荷之前迅速进入塑性变形阶段,从而保证建筑等主体结构的安全。软钢较大的塑性变形能力,可以保证阻尼器可以在地震中能够有足够的耗能能力,可以吸收掉地震中产生的能量,从而保护建筑等主体结构的安全。本文对目前阻尼器中常用的几种金属材料的耗能特性进行了综合分析与对比。通过对不同金属材料的屈服强度,循环效应以及大塑性变形行为进行详细全面的量化分析与对比,发现几种金属材料在剪切载荷作用下,表现出比拉伸条件下更大的变形能力;同时软钢材料相对于其他几种材料在变形能力和耗能上都有着巨大的优势。因此本文以软钢材料为研究对象,对其在多种载荷条件下的大塑性变形行为进行了深入的研究。基于线性优化准则对颈缩效应下的软钢材料单轴拉伸大塑性变形特性进行研究,构建软钢材料单向拉伸精确本构模型及等效剪切应力应变本构模型;对软钢材料单调剪切大塑性变形特性与循环剪切下的材料的循环硬化效应进行研究,构建软钢材料单调剪切与循环剪切本构模型方程;依据考虑初始屈服强度演化的双屈服面模型及循环载荷下结构的多轴效应,对本构模型进行优化修正,最终构建准确描述软钢阻尼器大塑性变形行为的精确本构模型。同时,根据建立的材料精确本构,提出双曲线简化本构模型,并对其精确性进行验证。本文建立的阻尼器结构精确数值分析模型及材料精确本构模型,实现了阻尼器结构小变形至大塑性变形下力学特性及变形行为的准确模拟,对准确评估阻尼器耗能性能和结构稳定性分析具有重要意义。同时,本文提出的精确本构详细的建模过程,对今后材料的大塑性本构精确建模具有重要参考意义。
[Abstract]:Mild steel damper is a new generation of structural parts which can be widely used in energy dissipation structure system. It has stable and reliable working performance and good energy dissipation ability by using soft steel material plastic deformation to achieve damping function. The very low yield point of mild steel can ensure that the dampers can quickly enter the plastic deformation stage before the building and other main structures are subjected to external loads such as earthquakes, thus ensuring the safety of the main structures such as buildings. The large plastic deformation capacity of mild steel can ensure that the dampers can have enough energy dissipation capacity in earthquakes and absorb the energy generated in earthquakes, thus protecting the safety of the main structures such as buildings. In this paper, the energy dissipation characteristics of several metal materials commonly used in dampers are comprehensively analyzed and compared. Through the quantitative analysis and comparison of yield strength, cyclic effect and large plastic deformation behavior of different metal materials, it is found that the deformation capacity of several metal materials under shear load is greater than that under tensile condition. At the same time, the soft steel material has a great advantage over other kinds of materials in deformability and energy dissipation. Therefore, the large plastic deformation behavior of soft steel under various loads is studied in this paper. Based on linear optimization criterion, the uniaxial tensile large plastic deformation characteristics of soft steel materials under necking effect were studied, and the exact constitutive model of uniaxial tension and equivalent shear strain constitutive model of soft steel materials were constructed. The large plastic deformation characteristics of monotone shear and cyclic hardening of soft steel materials are studied and the constitutive equations of monotone shear and cyclic shear of soft steel are established. According to the double yield surface model considering the evolution of initial yield strength and the multiaxial effect of the structure under cyclic load, the constitutive model is optimized and modified, and an accurate constitutive model for describing the large plastic deformation behavior of the soft steel damper is constructed. At the same time, a simplified hyperbolic constitutive model is proposed based on the material exact constitutive model, and its accuracy is verified. The precise numerical analysis model and the material exact constitutive model of the damper structure are established in this paper. The mechanical characteristics and deformation behavior of the damper structure under small deformation to large plastic deformation are simulated accurately. It is of great significance to evaluate the energy dissipation performance and structural stability of dampers accurately. At the same time, the detailed modeling process of the precise constitutive model proposed in this paper is of great significance for the accurate modeling of the large plastic constitutive model of materials in the future.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG142.1
[Abstract]:Mild steel damper is a new generation of structural parts which can be widely used in energy dissipation structure system. It has stable and reliable working performance and good energy dissipation ability by using soft steel material plastic deformation to achieve damping function. The very low yield point of mild steel can ensure that the dampers can quickly enter the plastic deformation stage before the building and other main structures are subjected to external loads such as earthquakes, thus ensuring the safety of the main structures such as buildings. The large plastic deformation capacity of mild steel can ensure that the dampers can have enough energy dissipation capacity in earthquakes and absorb the energy generated in earthquakes, thus protecting the safety of the main structures such as buildings. In this paper, the energy dissipation characteristics of several metal materials commonly used in dampers are comprehensively analyzed and compared. Through the quantitative analysis and comparison of yield strength, cyclic effect and large plastic deformation behavior of different metal materials, it is found that the deformation capacity of several metal materials under shear load is greater than that under tensile condition. At the same time, the soft steel material has a great advantage over other kinds of materials in deformability and energy dissipation. Therefore, the large plastic deformation behavior of soft steel under various loads is studied in this paper. Based on linear optimization criterion, the uniaxial tensile large plastic deformation characteristics of soft steel materials under necking effect were studied, and the exact constitutive model of uniaxial tension and equivalent shear strain constitutive model of soft steel materials were constructed. The large plastic deformation characteristics of monotone shear and cyclic hardening of soft steel materials are studied and the constitutive equations of monotone shear and cyclic shear of soft steel are established. According to the double yield surface model considering the evolution of initial yield strength and the multiaxial effect of the structure under cyclic load, the constitutive model is optimized and modified, and an accurate constitutive model for describing the large plastic deformation behavior of the soft steel damper is constructed. At the same time, a simplified hyperbolic constitutive model is proposed based on the material exact constitutive model, and its accuracy is verified. The precise numerical analysis model and the material exact constitutive model of the damper structure are established in this paper. The mechanical characteristics and deformation behavior of the damper structure under small deformation to large plastic deformation are simulated accurately. It is of great significance to evaluate the energy dissipation performance and structural stability of dampers accurately. At the same time, the detailed modeling process of the precise constitutive model proposed in this paper is of great significance for the accurate modeling of the large plastic constitutive model of materials in the future.
【学位授予单位】：江南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG142.1
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