﻿ Peel OffExamples | Product | Murata Software Co., Ltd.

# Example47Peel Off

### General

• The “peel off”, one of the settings of the simple contact boundary condition, is studied in this exercise.

• Two cubes are sandwiched by two plates. Both cubes are attached to the upper plate. The right cube is sticky and adheres to the lower plate. The left cube does not adhere to the lower plate at all. Their simple boundary conditions reflect the difference.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 2D Model unit mm

### Analysis Conditions

 Item Settings Solvers Mechanical Stress Analysis [Galileo] Analysis Type Static analysis Options Select thermal load

The Step/Thermal Load tab is set as follows.

Tab

Setting Item

Setting Item

Step Setting

Reference temperature

25[deg]

Step/Reached Temperature Setting

 Step Number of substeps Reached temperature[deg] 1 1 50 2 1 0 3 1 -25

### Model

Two cubes are sandwiched by two plates. Both cubes are attached to the upper plate. The top face of the upper plate and the bottom face of the lower plate are fixed.

The right cube is sticky and adheres to the lower plate. The left cube does not adhere to the lower plate at all. Their simple boundary conditions reflects the difference.

### Body Attributes and Materials

 Body Number/Type Body Attribute Name Material Name 0/Sheet Body Fixed_Plate Plate 1/SheetBody Fixed_Plate Plate 2/SheetBody Bond_Cube Cube 3/SheetBody Bond_Cube Cube

The material properties are set up as follows. The coefficient of expansion of the plates is set to zero.

 Material Name Tab Properties Plate Elasticity Material Type: Elastic/Isotropic Young’s modulus: 1×10^9[Pa] Poisson’s ratio: 0.3 Coefficient of Expansion 0.0 [1/deg] Cube Elasticity Material Type: Elastic/Isotropic Young’s modulus: 1×10^9[Pa] Poisson’s ratio: 0.3 Coefficient of Expansion 10.0 [1/deg]

### Boundary Conditions

The boundary conditions set on the bottoms of the two cubes are different. See the table below for details.

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings Fix/Edge Mechanical Displacement Select the X and Z components. UX=0, UZ=0 Auto_Dry/Edge Mechanical Simple contact Simple contact classification : Automatic judgment Automatic judgment setting : Coefficient of friction : 0.0 Peel off taken into account : Deselected Auto_Sticky/Edge Mechanical Simple contact Simple contact classification : Automatic judgment Automatic judgment setting : Peel off taken into account : Selected Peel strength : 5×10^3[Pa]

### Results

The deformation and the maximum principal stresses (vectors) are shown below for each step.

< Step 1 / Reached temperature = 50 deg. >

 Slip Bond

The cubes expand due to the temperature rise.

The left cube slips on the lower plate and the right cube adheres to the lower plate.

< Step 2 / Reached temperature = 0 deg. >

 Off contact Bond

The cubes contract due to the descent of the temperature.

The left cube is off the lower plate. The right cube still adheres to the plate because the tensile stress on the boundary is less than the peel-off withstanding strength (5[kPa]).

< Step 3 / Reached temperature = -25 deg. >

 Off contact Off contact

Finally, the right cube is off the lower plate because the tensile stress exceeds the peel strength.

﻿