My question is how we can predict the crack growth rate and direction for a structure under cyclic loading in such a way that both plasticity and creep has been built in it.
Welcome to the February 2009 issue. In this issue, we will discuss the use of finite elements (FEs) in quantum mechanics, with specific focus on the quantum-mechanical problem that arises in crystalline solids. We will consider the electronic structure theory based on the Kohn-Sham equations of density functional theory (KS-DFT): in real-space, Schrödinger and Poisson equations are solved in a parallelepiped unit cell with Bloch-periodic and periodic boundary conditions, respectively.
Hi,
I am trying to cool glass (viscoelastic material model) from its
transition temperature to a specific temperature near its annealing
temperature by gradual cooling, by specifying the cooling rate. I want
to estimate the residual stresses as a result.
I am not clear as to how to specify the problem in ANSYS. For ex,
if I want to cool from 500 C (which is also my reference temperature)
to 200 C at the rate of 2C/sec, then how do I specify the cooling rate
and the end temperature in ANSYS?
新技术无力测试损检测残余应
导言
内部压力，也应视为如下： 1 ）业务株提到负荷的材料是受计算2 ）残余应力引起的材料热处理或强调造成的焊接，锻造，铸造等方面的新技术能够衡量载荷和残余应力的平衡表面的材料，并在一个比较大的音量，有时甚至相同的大小作为整个结构。这强调的是部分金属的弹性场和有三个轴的空间取向。
描述
弹性振荡（也称为振动）的弹性材料组成的小学群众轮流走动各自的平衡位置;这些运动造成的潜力转化成能源的动能。这种现象发生，由于反应（弹性部队） ，上述群众生产反对弹性运动;这些反应是成正比根据胡克定律，以相同的动作。弹性波的传播产生按照固定的速度，取决于如何迅速元素群众开始振荡。
When we have stress, say in x direction, due to poisson effect, we get strain in y and z directions.
What is the reason that associated stress does not develop due to this strain in y and z directions? Is it due to the fact that there is no restraint to this strain, something similar to when free thermal expansion does not result in stress?
Dear researchers.
I am trying to start studying HIFU (high intensity focused ultrasound) absorption mechanisms and modeling methods, specially for clinical applications(absorption in tissue). But I cant find any straightforward article in this field.Would you please help me on this.
With great Thanks.
Dear all
I need help in executing ANSYS user programmable feature (UPF), specifically subroutine userpr (changing element pressure information) for my 2D model. I have read the manual but don't understand the subroutine program structure (attached below). Can someone kindly explain how can I activate and run the subroutine?
Thanks,
Samuel
"Subroutine Userpr text file":
