scholarly journals Effect of Braiding Angle on the Impact and Post-Impact Behavior of 3D Braided Composites

2017 ◽  
Vol 49 (1) ◽  
pp. 198-205 ◽  
Author(s):  
S. Yan ◽  
L. Y. Guo ◽  
J. Y. Zhao ◽  
X. M. Lu ◽  
T. Zeng ◽  
...  
Keyword(s):  
Impact Behavior ◽  
Braided Composites ◽  
3D Braided Composites ◽  
Post Impact ◽  
Braiding Angle ◽  
The Impact

Experimental Research on Low-Velocity Impact Properties of 3D Braided Composites

2010 ◽  
Vol 97-101 ◽  
pp. 1741-1744
Author(s):  
Qi Jia ◽  
Ya Nan Jiao
Keyword(s):  
Three Dimensional ◽  
Low Velocity Impact ◽  
Braided Composites ◽  
Low Velocity ◽  
Impact Properties ◽  
Damage Area ◽  
3D Braided Composites ◽  
Glass Fiber Reinforced ◽  
Braiding Angle ◽  
The Impact

This research dealt with the impact properties of glass fiber reinforced composites manufactured from different structures of three-dimensional braided preforms. Three different architectures of the braid structures, 4-Direction, 5-Direction and 6-Direction, were investigated together with three further various braiding angles of each architecture. The effect of architecture and braiding angle parameters upon the impact was examined. Damage morphology of the impacted materials was characterized. It has been found that the parameters affected the damage resistance and tolerance of composites evidently. 6-Directional composites showed higher impact toughness than the others with same braiding angle. Failure of the specimens with small damage area revealed the brittle characteristic of 3D braided composite.

Resolving the Unique Invariant Slip-Direction in Rigid Three-Dimensional Multi-Point Impacts at Stick-Slip Transitions

2018 ◽  
Author(s):  
Abhishek Chatterjee ◽  
Alan Bowling
Keyword(s):  
Single Point ◽  
Three Dimensional ◽  
Impact Behavior ◽  
Slip Direction ◽  
Stick Slip ◽  
Impact Forces ◽  
Post Impact ◽  
Impact Problems ◽  
Slip Transition ◽  
The Impact

This work presents a new approach for resolving the unique invariant slip direction at Stick-Slip Transition during impact. The solution method presented in this work is applicable to both single-point and multi-point impact problems. The proposed method utilizes rigid body constraints to resolve the impact forces at all collision points in terms of a single independent impact forces parameter. This work also uses an energetic coefficient of restitution to terminate impact events, thereby yielding energetically consistent post-impact behavior.

Vibrations due to Impact in a Non Ideal Mechanical System With a Non-Linear Hertzian Contact Model

2014 ◽  
Author(s):  
Helio A. Navarro ◽  
Jose M. Balthazar ◽  
Reyolando M. L. R. F. Brasil
Keyword(s):  
Mechanical System ◽  
Rigid Wall ◽  
Contact Forces ◽  
Hertzian Contact ◽  
Impact Behavior ◽  
Steady State Responses ◽  
Post Impact ◽  
The Impact ◽  
The Mathematical Model ◽  
State Responses

This work analyses the post impact behavior of a mechanical system consisting of an oscillator and an unbalanced non–ideal electrical motor. The impact between the mechanical system and a rigid wall is based on the assumption that the impacting bodies undergo local deformations. The method used in the present work is similar to the Discrete Element Method for particle systems modeled with a “soft–sphere” mechanism. The contact forces are modeled using a nonlinear damped Hertzian Spring-Dashpot system. The mathematical model of the mechanical system is represented by a set of nonlinear ordinary differential equations. The transient and steady-state responses are discussed. As the motor is considered a non ideal energy source, the Sommerfeld effect is also analyzed. The impact model is first applied for a single freely falling particle and then in the proposed mechanical system. Non-dimensional expressions for the contact force and numerical simulations of the mechanical system behavior are also presented.

Study of the Stick-Slip Transition of Newton’s Cradle With Friction

2013 ◽  
Author(s):  
Adrian Rodriguez ◽  
Alan Bowling
Keyword(s):  
Impact Behavior ◽  
Multiple Point ◽  
Stick Slip ◽  
Kinematic Relationship ◽  
Short Time Span ◽  
Post Impact ◽  
Newton’S Cradle ◽  
Six Degree Of Freedom ◽  
Slip Transition ◽  
The Impact

This work uses a new discrete approach to analyze the stick-slip transition of Newton’s cradle with frictional contact. The consideration of friction here leads to a simultaneous, multiple point, indeterminate collision. This work strictly adheres to the assumptions of rigid body modeling in conjunction with the notion that the configuration of the system are constant in the short time span of the collision, which enforces a kinematic relationship between the impact points. The post-impact velocities are determined by using the work-energy relationship of a collision and an energetic coefficient of restitution (ECOR) to model energy dissipation. A three and six degree-of-freedom (DOF) model of the system is considered in this work to examine the stick-slip transition and simulate the post-impact behavior. Simulations are conducted for each model using different coefficients of friction (COFs). The results obtained are compared to theoretical and experimental results reported in other works.

scholarly journals Fatigue Behavior of 3D Braided Composites Containing an Open-Hole

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2147
Author(s):  
Shuangqiang Liang ◽  
Qihong Zhou ◽  
Haiyang Mei ◽  
Ge Chen ◽  
Frank Ko
Keyword(s):  
Cross Section ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Fatigue Properties ◽  
Failure Behavior ◽  
Braided Composites ◽  
Damage Area ◽  
3D Braided Composites ◽  
Mechanical Performances ◽  
Braiding Angle

The static and dynamic mechanical performances of notched and un-notched 3D braided composites were studied. The effect of longitudinal laid-in yarn was investigated in comparison with low braiding angle composites. The specimens were fatigue tested for up to millions of cycles, and the residual strength of the samples that survived millions of cycles was tested. The cross-section of the 3D braided specimens was observed after fatigue loading. It was found that the static and fatigue properties of low angle 3D braided behaved better than longitudinally reinforced 3D braided composites. For failure behavior, pure braids contain damage better and show less damage area than the braids with longitudinal yarns under fatigue loading. More cracks occurred in the 3D braided specimen with axial yarn cross-section along the longitudinal and transverse direction.

A parameterized unit cell model for 3D braided composites considering transverse braiding angle variation

2021 ◽  
pp. 002199832110539
Author(s):  
Weijie Zhang ◽  
Shibo Yan ◽  
Ying Yan ◽  
Yiding Li
Keyword(s):  
Fiber Volume Fraction ◽  
Volume Fraction ◽  
Cell Model ◽  
Unit Cell ◽  
Unit Cell Model ◽  
Braided Composites ◽  
Fiber Volume ◽  
Angle Variation ◽  
3D Braided Composites ◽  
Braiding Angle

In this paper, a parameterized unit cell model for 3D braided composites considering transverse braiding angle variation is proposed, to assist the mechanical characterization of such materials. According to the geometric characteristics of 3D braided composites, a method for automatically generating textile geometries based on practical braiding parameters, including the main braiding angle, the transverse braiding angle, and the fiber volume fraction, is established and implemented in a CAD software package. In this model, the addition of transverse braiding angle educes a more flexible control of fiber volume fraction distribution, and with the combination of control parameters according to the actual fiber distribution needs of users, it can suggest the appropriate parameters for the unit cell. The generated unit cell models are used in finite element analysis and the results are validated against experiments for a number of 3D braided composites in terms of fiber volume fraction and elastic constants, and good agreement is observed. Based on the parameterized unit cell model, the effects of main braiding parameters on the elastic properties of 3D braided composites are discussed.

scholarly journals Comparison of the Post-Impact Behavior of Tubular Braided and Filament Wound Glass/Polyester Composites under Compression

2014 ◽  
Vol 9 (2) ◽  
pp. 155892501400900 ◽  
Author(s):  
Zahra Tadi Beni ◽  
Majid Safar Johari ◽  
Mohammad Saleh Ahmadi
Keyword(s):  
Volume Fraction ◽  
Impact Load ◽  
Unsaturated Polyester ◽  
Experimental Tests ◽  
Impact Behavior ◽  
Braided Composites ◽  
Fiber Volume ◽  
Compression Properties ◽  
Filament Wound ◽  
The Impact

In this study, different tubular braided and filament wound structures were produced using a Maypole braiding machine with glass fiber and then consolidated with unsaturated polyester resin using the Vacuum Infusion Process (VIP). For experimental tests, half of the samples were impacted in the center with 2.74 J impact energy. Then the compression test was conducted on all of the specimens. Graphs of force-elongation were obtained and the failure works of the specimens were calculated. It was observed that non-impacted filament wound tubular composites have 34% higher failure work than those of their braided counterparts with the same fiber volume fraction (FVF), which is due to the existence of more reinforcing layers in filament wound structure compared with braided composites. The braided composites with the same number of layers as filament-wound ones have higher FVF and higher wall thickness, hence, show higher compression properties. However, the drop of compression properties after the impact load is significantly higher in filament wound composites compared with the braided ones with the same FVF. Therefore it can be concluded that the interlacing structure of fibers in braided composites controls the delamination and restricts the propagation of cracks in the structures after being subjected to impact loads, and causes a less drop in the compression properties of the composites.

Sign in / Sign up

Export Citation Format

Share Document