A simple node-to-segment contact technique of finite element models of elastic bodies to attain the node-to-node contact accuracy

2013 ◽  
Vol 228 (7) ◽  
pp. 1089-1093 ◽  
Author(s):  
Kisu Lee
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Contact Point ◽  
Finite Element Models ◽  
Elastic Bodies ◽  
Contact Constraint

By modifying the contact point displacement with a simple and systematic way, it has been explained that the node-to-segment contact solution can become as accurate as that of the node-to-node contact constraint. The accuracy of the solution is demonstrated by the numerical simulation using a punch sliding on the slab.

scholarly journals The Effect of Swinging Ball Heads with Different Arrangements in Multi-Point Stretch-Forming Process

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 337 ◽  
Author(s):  
Jian Xing ◽  
Yan-yan Cheng ◽  
Zhuo Yi
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Sheet Metal ◽  
Strain Distribution ◽  
Finite Element Models ◽  
Stretch Forming ◽  
Forming Process ◽  
Forming Quality ◽  
Staggered Arrangement ◽  
Simulation Results

To improve the effect of multi-point stretch forming of sheet metal, it is proposed in this paper to replace a fixed ball head with a swinging ball head. According to the multi-point dies with different arrangements, this research establishes finite element models of the following stretch forming, i.e., fixed ball heads with conventional arrangement, swinging ball heads with conventional arrangement, swinging ball heads with declining staggered arrangement, and swinging ball heads with parallel staggered arrangement, and then numerical simulation is performed. The simulation results show that by replacing a fixed ball head with a swinging ball head, the surface indentation of the part formed was effectively suppressed, the stress and tension strain distribution of the part formed was improved, and the forming quality was improved; the thickness of the elastic pad was reduced, the springback was reduced and the forming accuracy was improved; and when the ball head was applied to a multi-point die with staggered arrangement, a better forming result was achieved, where the best forming result was achieved in combining the swinging ball heads with the multi-point die with a parallel staggered arrangement. Forming experiments were carried out, and the experimental results were consistent with the trend of numerical simulation results, which verified the correctness of the numerical simulation.

Analysis on the Seismic Performance of RC Frame Beam-Column Joints Strengthened by Sprayed FRP

2014 ◽  
Vol 578-579 ◽  
pp. 835-838 ◽  
Author(s):  
Zhao Yang ◽  
Cai Wu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Seismic Performance ◽  
Pressure Ratio ◽  
Finite Element Models ◽  
Rc Frame ◽  
Axial Pressure ◽  
Concrete Frame ◽  
Different Thickness

The seismic performance of RC frame beam-column joints was analyzed by using ANSYS in the paper. Firstly, reasonable finite element models were established by comparing the result of numerical simulation to experiment. Thus the seismic performance of concrete frame joints strengthened by Sprayed FRP was studied, and influence on the seismic performance by different thickness, length of Sprayed FRP, and different axial pressure ratio of column were analyzed in the paper too. Studies showed that reinforcing the concrete frame joints with Sprayed FRP is effective.

Study on Numerical Simulation of Projectile Penetrating UHMWPE Fiber Layers and Effects of Projectile Parameters

2012 ◽  
Vol 630 ◽  
pp. 121-126
Author(s):  
Gong Wu Huang ◽  
Ai Jun Chen ◽  
Shao Min Luo ◽  
Cheng Xu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
High Speed ◽  
Research Approach ◽  
Finite Element Models ◽  
Uhmwpe Fiber ◽  
Penetration Ability ◽  
The Relationship ◽  
Better Than ◽  
Good Agreement

Finite element models of bullet penetrating UHMWPE fiber layers are established to study the relationship between parameters of projectile and penetration ability using LS-DYNA software. The numerical simulation results of penetration calculated in Lagrange algorithm are in good agreement with the real experimental results, which verify the validity of the finite element models and algorithm. The numerical results show that high speed and small angle of attack can improve the penetration ability, the penetration ability of oval projectile is better than flat head projectile. A valid and reliable research approach for evaluating the design of protective equipment and efficiency of projectiles are proposed.

scholarly journals Interaction of rack-and-pinion lock parts under external load

2019 ◽  
pp. 105-112
Author(s):  
Evgeniy Gusev ◽  
Viktor Krasavtsev
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
External Load ◽  
Accurate Determination ◽  
Three Dimensional ◽  
Design Criteria ◽  
Finite Element Models ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper describes numerical simulation and analysis of interaction between the parts of rack-and-pinion lock under operational external load, so as to develop design criteria and recommendations for its joints, as well as for more accurate determination of clearances between coamings and hatch covers, required to develop water-tight rubber sealings. These tasks are accomplished by means of detailed three-dimensional finite-element models representing two variants of rack-and-pinion lock, with their further verification. The study included numerical simulation of contact interaction between the parts of the lock, as well as analysis of design solutions for its main joints. As a result, coaming-cover clearances have been determined and manufacturing requirements to rubber sealings of the lock variants under investigation have been successfully formulated.

scholarly journals The Effect of Swinging Ball Heads with Different Arrangements in Multi-Point Stretch Forming Process

2019 ◽  
Author(s):  
Jian Xing ◽  
Yan-yan Cheng ◽  
Zhuo Yi
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Strain Distribution ◽  
Finite Element Models ◽  
Stretch Forming ◽  
Forming Process ◽  
Forming Quality ◽  
Staggered Arrangement ◽  
Simulation Results ◽  
Formed Part

To improve the effect of multi-point stretch forming of sheet metal, it is proposed in this paper to replace fixed ball head with swinging ball head. According to the multi-point dies with different arrangements, this research establishes the finite element models of the following stretch forming, i.e. fixed ball heads with conventional arrangement, swinging ball heads with conventional arrangement, swinging ball heads with declining staggered arrangement, and swinging ball heads with parallel staggered arrangement and then numerical simulation is performed. The simulation results show that by replacing fixed ball head with swinging ball head, the surface indentation of the formed part was effectively suppressed, the stress and tension strain distribution of the formed part was improved and the forming quality was improved; that the thickness of the elastic pad was reduced, the springback was reduced and the forming accuracy was improved; and that when the ball head was applied to multi-point die with staggered arrangement, better forming result was achieved, where the best forming result was achieved in combining the swinging ball heads with the multi-point die with parallel staggered arrangement. The forming experiments were carried out, and the experimental results were consistent with the trend of numerical simulation results, which verified the correctness of the numerical simulation.

Research on the Crashworthiness of FLNG Side Structures in the Side-by-Side Offloading Operation With LNGC

2015 ◽  
Author(s):  
Dongwei Zhang ◽  
Zhiqiang Hu ◽  
Gang Chen
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Model Test ◽  
High Probability ◽  
Structural Response ◽  
Simulation Method ◽  
Finite Element Models ◽  
Basic Design ◽  
Probability Of Collision ◽  
Special Limit

On purpose of evaluating the crashworthiness of FLNG side structures in case of the collision accident during the side-by-side offloading operation, a unique research is conducted in this paper with numerical simulation method. According to the model test completed in Deepwater Offshore Basin in Shanghai Jiao Tong University, there does exist a high probability of collision between FLNG and LNGC in the side-by-side offloading operation. To perform numerical simulations, finite element models were built. For the FLNG model, the side structures contain the detailed LNG cargo containment system. According to the parameters obtained from the model test, two typical collision scenarios are defined. Then the collision scenarios are simulated by the LS_DYNA code. A special limit collision state is proposed based on the structural response of LNG CCS. With respect to the numerical results, great attention is paid to the structural response of CCS to evaluate the safety of FLNG side structures. Furthermore, some insights useful for the basic design of FLNG are put forward.

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