Dynamic Characteristics of Laminated Woven E-Glass–Epoxy Composite Plates Subjected to Lowvelocity Heavy Mass Impact

Abstract

The main goal of this study is to examine the size effects including both in-plane dimensional and thickness effects for laminated woven E-glass–epoxy composite subjected to low velocity heavy mass impact. The studies have been carried out with plate dimensions of 150 × 150 mm, 150 × 100 mm and 150 × 50 mm for in-plane dimensional effect. Two nominal thicknesses with averages of 1.4 and2.8 mm are used for studying the thickness effect. The impact testings are conducted with a vertical drop-weight testing machine developed in the department laboratory. Affixed to the drop-weight device, a piezoelectric force transducer, localized in the hemispherical impactor nose, yields the complete force versus time history of impact event. Impact tests are performed at increasing impact velocities 1, 2 and 3m/s and impactor mass of 2.6 kg on clamped plates. A numerical evaluation of these specimens is also carried out by using 3DIMPACT transient dynamic finite element analysis code. The contact forces between the impactor and the composite plate as functions of time, transient stresses during impact and the predicted delamination sizes of composites are found numerically.

Effect of embedded delaminations on impact behavior of laminated composites

“…Karakuzu et al, [9] carried out both experimental and numerical analysis to examine some parameters such as the effects of impact energy, impactor mass and impact velocity on the maximum contact force, maximum deflection, contact time, absorbed energy, and overall damage area of glass/ epoxy laminated composites. Aslan et al, [10]- [11] presented a numerically and experimentally study to investigate the effects of the impactor velocity, thickness and in-plane dimensions of target and impactor mass on the response of laminated composite plates under low velocity impact. Sabancı and Karakuzu, [12] investigated the impact behavior of laminated composites with embedded delaminations.…”

Nonlinear Vibration and Dynamic Response of Three-Dimensional Braided Composite Plates

“…The essence of this procedure, in the present case, is to assume that of W j w j , which are then inserted into Eq. (17). The asymptotic solutions, up to third-order, can be obtained as W = ε[w 1 (τ) + g 1ẅ1 (τ)] sin mx sin ny + (εw 1 (τ)) 3 [µg 311 sin mx sin ny + g 331 sin 3mx sin ny…”

“…An accurate characterization of their nonlinear dynamic behavior is therefore crucial to the success of textile composite plates in engineering design. There have been a large number of investigations concerning the dynamics of textile composites, the majority of which focused on the impact response, damage initiation and accumulation, ballistic penetration or failure mode of woven or braided composite plates under various impact loads, see, for example, those by Baucom et al [13], Bahei-El-Din and Zikry [14], Iannucci et al [15], Yehia and Mohmmed [16], Aslan et al [17], and Schwer and Whirley [18], among many others. Studies on the free vibration, however, are still very limited.…”

A Novel Method for Detecting and Characterizing Low Velocity Impact (Lvi) in Commercial Composite

“…By using metallic impactors, a drop weight method can be used to study the low velocity impact threat of tool drop and foreign object damage (FOD). The damage in the composites subjected to low-velocity impact may be invisible as it consists of internal delamination [19]. It is vital to understand the damage involved in the impact of composites.…”