In this post, we are going to analyze the stress and deformation of a rubber O ring as shown in the following figure. The rubber O ring is often used for sealing purposes. It may be under large pressure and its deformation is constrained by the sealing groove. Due to the large difference in the … Continue reading The stress and deformation analysis of a rubber O ring
General
Harmonic analysis: A steel disk example
Harmonic analysis is used to determine the steady-state response of a linear structure to loads that vary sinusoidally (harmonically) with time, thus enabling you to verify whether or not your designs will successfully overcome resonance, fatigue, and other harmful effects of forced vibrations. This analysis technique calculates only the steady-state, forced vibrations of a structure. … Continue reading Harmonic analysis: A steel disk example
Examples of 3D Mapped Meshing
In the last post, some examples of 2D mapped meshing are given. Here we are going to look at some examples of 3D mapped meshing. Similar to 2D mapped meshing, the strategy is straightforward: divide the domain in such a way that all the subdomains meet certain requirements, specify the element size or the number … Continue reading Examples of 3D Mapped Meshing
Examples of 2D Mapped Meshing
Some techniques in 2D mapped meshing
Large Lateral Deflection of Unequal Stiffness Springs
A two-spring system is subjected to a force F as shown below. l=10 cm, k1=8N/cm, and k2=1N/cm. F=5*2^0.5N. Determine the strain energy of the system and the displacements δx and δy. The solution to this problem is best obtained by adding mass and using the "slow dynamics" technique with approximately critical damping. Combination elements (COMBIN40) are … Continue reading Large Lateral Deflection of Unequal Stiffness Springs
Wear analysis of casing coupling
Fig.1. Typical casing couplings Because the reciprocating and rotary motion of the drill pipe in the casing is eccentric, the radial and axial friction between the drill pipe and the casing causes serious wear on the outer surface of the drill pipe and the inner surface of the casing. This wear mostly occurs at the … Continue reading Wear analysis of casing coupling
The Analysis of Piston Rubber Film of Pneumatic Brake Device
Fig.1. Typical piston rubber films (with central hole) Fig.2. A typical piston rubber film Fig.3. A typical piston rubber film (edge can be fixed with bolts) Typical piston rubber films in a pneumatic brake device that is commonly used in drilling operations are shown in Fig.1-Fig.3. When the brake device is activated, the piston rubber … Continue reading The Analysis of Piston Rubber Film of Pneumatic Brake Device
The stress-strain curve of rubber material stiffened by carbon fiber
Fig.1. Illustration of the discretization and BCs A 2D model is created. Plane elements and beam elements are used to discretize rubber material and carbon fiber, respectively. To ensure that rubber and carbon fiber deform together (no slipping), plane elements and beam elements share common nodes. A concentrated force (the red arrow in Fig.1) is … Continue reading The stress-strain curve of rubber material stiffened by carbon fiber
Xutao Sun 