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How to calculate the volume of deformation in Solid Mechanics interface
Posted 18 giu 2015, 20:30 GMT-4 Structural Mechanics 1 Reply
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Hi,everyone,
I account for some trouble,the model as follows.I need your help!Bless!
Question :In the model you build and solve an 2D axisymmetric model using the Solid Mechanics interface.The model contains an axisymmetric cylinder with sphere cavity.The radius of cylinder and sphere cavity is 25mm,15mm respectively.The material chooses Linear Elastic Material.Young's modulus is 10MPa.Density is 1300kg/m3.Poisson's ratio is 0.49.The top boundary of the cylinder is setting Boundary Load with the type list Pressure,ranging from 0MPa to 5MPa,and the bottom boundary of the cylinder is fixed.How to calculate the volume of the sphere cavity and the cylinder after deformation under pressure by the COMSOL software.
We calculate the multiply between the r-coordinate(or z-coordinate) and the geometry normal-x component(or the geometry normal-z component) of the sphere cavity boundary in the deformed geometry,and then compute the multiply integration of a surface integral to get the volume of the sphere cavity.
Two issues occur.One is that the volume which is get by the integration is invariant accompanying the change of the boundary load,it is the same as the without load geometry.The other is that in theory the volume of r-direction calculating is equal to the the volume of z-direction calculating,but by the above method the both results are different.
On the other hand,we want to computer the integral on the top boundary of the initial spatial frame to get the compression volume of cylinder,and then calculate the volume after deformation.However,in the Solid Mechanics interface we only find the displacement component on the material frame,and the results are obviously wrong.How can we get the displacement component on the spatial frame.
I account for some trouble,the model as follows.I need your help!Bless!
Question :In the model you build and solve an 2D axisymmetric model using the Solid Mechanics interface.The model contains an axisymmetric cylinder with sphere cavity.The radius of cylinder and sphere cavity is 25mm,15mm respectively.The material chooses Linear Elastic Material.Young's modulus is 10MPa.Density is 1300kg/m3.Poisson's ratio is 0.49.The top boundary of the cylinder is setting Boundary Load with the type list Pressure,ranging from 0MPa to 5MPa,and the bottom boundary of the cylinder is fixed.How to calculate the volume of the sphere cavity and the cylinder after deformation under pressure by the COMSOL software.
We calculate the multiply between the r-coordinate(or z-coordinate) and the geometry normal-x component(or the geometry normal-z component) of the sphere cavity boundary in the deformed geometry,and then compute the multiply integration of a surface integral to get the volume of the sphere cavity.
Two issues occur.One is that the volume which is get by the integration is invariant accompanying the change of the boundary load,it is the same as the without load geometry.The other is that in theory the volume of r-direction calculating is equal to the the volume of z-direction calculating,but by the above method the both results are different.
On the other hand,we want to computer the integral on the top boundary of the initial spatial frame to get the compression volume of cylinder,and then calculate the volume after deformation.However,in the Solid Mechanics interface we only find the displacement component on the material frame,and the results are obviously wrong.How can we get the displacement component on the spatial frame.
1 Reply Last Post 19 giu 2015, 03:52 GMT-4
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