Factors influencing impact force profile and measurement accuracy in drop weight impact tests

2020 ◽  
Vol 145 ◽  
pp. 103688 ◽  
Author(s):  
Huawei Li ◽  
Wensu Chen ◽  
Hong Hao
Keyword(s):  
Measurement Accuracy ◽  
Impact Force ◽  
Impact Tests ◽  
Factors Influencing ◽  
Drop Weight ◽  
Force Profile ◽  
Weight Impact

Analytical and numerical studies on impact force profile of RC beam under drop weight impact

2021 ◽  
Vol 147 ◽  
pp. 103743
Author(s):  
Huawei Li ◽  
Wensu Chen ◽  
Thong M. Pham ◽  
Hong Hao
Keyword(s):  
Impact Force ◽  
Rc Beam ◽  
Numerical Studies ◽  
Drop Weight ◽  
Force Profile ◽  
Weight Impact

Numerical and experimental investigation of simply supported steel beams under drop‐weight impact tests

ce/papers ◽  
2019 ◽  
Vol 3 (3-4) ◽  
pp. 803-809
Author(s):  
Marina D'Antimo ◽  
Massimo Latour ◽  
Jean‐Pierre Jaspart ◽  
Jean‐François Demonceau
Keyword(s):  
Experimental Investigation ◽  
Steel Beams ◽  
Simply Supported ◽  
Impact Tests ◽  
Drop Weight ◽  
Weight Impact

Experimental and Numerical Studies of S2-Glass Fiber/Toughened Epoxy Composite Beams Subject to Drop-Weight or Ballistic Impact

2007 ◽  
Author(s):  
E. Sevkat ◽  
B. M. Liaw ◽  
F. Delale ◽  
B. B. Raju
Keyword(s):  
Finite Element ◽  
Impact Force ◽  
Damage Model ◽  
Composite Beams ◽  
Ballistic Impact ◽  
Nonlinear Finite Element ◽  
Experimental Results ◽  
Anisotropic Damage ◽  
Drop Weight ◽  
Weight Impact

A combined experimental and 3-D dynamic nonlinear finite element approach was adopted to study composite beams subject to drop-weight or ballistic impact. The composite specimens, made of S2 glass-reinforced toughened epoxy (44% fiber volume fraction, cured at 350°F), had 24 layers (approximately 6.35 mm) with various stacking sequences. They were damaged by impacts using either an Instron-Dynatup 8520 instrumented drop-weight impact tester (low-velocity impact) or an in-house high-speed gas gun (ballistic impact). For both types of tests, the time-histories of dynamic strains induced during impact were recorded using strain gages mounted on the front and back of the composite beam specimen. For drop-weight impact tests, the time history of impact force was also recorded; whereas for ballistic impact tests, only the impact velocity was calculated from the recorded change in voltage outputs, which resulted from the traversing of the impactor through two optical paths formed by two sets of diode laser-amplified photo diode pairs. The commercially available 3-D dynamic nonlinear finite element software, LS-DYNA, incorporated with a proposed nonlinear anisotropic damage model, was then used to simulate the experimental results. Good agreement between experimental and FEM results can be seen from comparisons of dynamic strain and impact force histories and damage patterns. Once the proposed nonlinear anisotropic damage model was verified by experimental results, further finite element simulations were conducted to predict the ballistic limit velocity (V50) for penetration prevention.

scholarly journals Analysis of Impact Characteristics and Detection of Internal Defects for Unidirectional Carbon Composites with Respect to Fiber Orientation

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 203
Author(s):  
Sun-ho Go ◽  
Alexandre Tugirumubano ◽  
Hong-gun Kim
Keyword(s):  
Carbon Fiber ◽  
Impact Test ◽  
Carbon Fiber Composites ◽  
Internal Defects ◽  
Impact Tests ◽  
Drop Weight ◽  
Weight Impact ◽  
Fibers Orientation ◽  
Lock In ◽  
The Impact

With the increasing use of carbon fiber reinforced plastics in various fields, carbon fiber composites based on prepregs have attracted attention in industries and academia research. However, prepreg manufacturing processes are costly, and the strength of structures varies depending on the orientation and defects (pores and delamination). For the non-contact evaluation of internal defects, the lock-in infrared thermography was proposed to investigate the defects in the composites subjected to the compression after impact test (CAI). The drop-weight impact test was conducted to study the impact behavior of the composites according to fibers orientation for composite fabricated using unidirectional (UD) carbon fiber prepregs. Using CAI tests, the residual compressive strengths were determined, and the damage modes were detected using a thermal camera. The results of the drop weight impact tests showed that the specimen laminated at 0° suffered the largest damage because of susceptibility of the resin to impact. The specimens with 0°/90° and +45°/−45° fibers orientation exhibited more than 90% of the impact energy absorption and good impact resistance. Furthermore, the specimens that underwent the impact tests were subjected to compressive test simultaneously with the lock-in thermography defects detection. The results showed that internal delamination, fibers splitting, and broken fibers occurred. The temperature differences in the residual compression tests were not significant.

Simulation of drop-weight impact and compression after impact tests on composite laminates

2012 ◽  
Vol 94 (11) ◽  
pp. 3364-3378 ◽  
Author(s):  
E.V. González ◽  
P. Maimí ◽  
P.P. Camanho ◽  
A. Turon ◽  
J.A. Mayugo
Keyword(s):  
Composite Laminates ◽  
Impact Tests ◽  
Drop Weight ◽  
Compression After Impact ◽  
Weight Impact

scholarly journals Experimental and Numerical Simulation Studies of RC Beams under the Actions of Equal Energy Impact Loads

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Xiwu Zhou ◽  
Xiangyu Wang ◽  
Runcheng Zhang ◽  
Wen Zhang
Keyword(s):  
Impact Velocity ◽  
Impact Force ◽  
Impact Testing ◽  
Rc Beams ◽  
Finite Element Software ◽  
Equal Energy ◽  
Drop Weight ◽  
Weight Impact ◽  
The Impact ◽  
Peak Value

In this study, two groups of RC beams were subjected to low-speed drop weight impact test by using the domestic advanced ultrahigh heavy-duty drop weight impact testing machine system. The main aspects studied are the influence of the combination of different impact velocity and mass on the dynamic response and local and global damage change of RC beam under the same impact energy. Next, the numerical model considering material strain rate is established using ABAQUS finite element software to verify and expand the experimental results. The results show the following: (1) under the condition of equal energy, the peak value of impact force measured in this experiment increases with the increase of impact velocity, yet the mid span displacement and rebar strain first increase and then decrease. In addition, when the impact velocity is 2.25 m/s and the impact mass is 400 kg, the beam has the most serious damage; (2) compared with the mass, the impact velocity has more obvious effects on the peak value of cumulative impact force, mid span displacement, and rebar strain; (3) with the decrease of the impact velocity (the increase of the mass), the local damage of the beam is gradually weakened and the overall damage is gradually exacerbated. The failure mode of the beam is transformed from local punching shear failure to overall static failure type.

scholarly journals Simulating drop-weight impact and compression after impact tests on composite laminates using conventional shell finite elements

2018 ◽  
Vol 144-145 ◽  
pp. 230-247 ◽  
Author(s):  
E.V. González ◽  
P. Maimí ◽  
E. Martín-Santos ◽  
A. Soto ◽  
P. Cruz ◽  
...  
Keyword(s):  
Finite Elements ◽  
Composite Laminates ◽  
Impact Tests ◽  
Drop Weight ◽  
Compression After Impact ◽  
Weight Impact
Sign in / Sign up

Export Citation Format

Share Document