Abstract
The impact behavior of carbon fiber epoxy bumper brackets reinforced with 2D biaxial and 2D triaxial braids was experimentally and numerically analyzed. For this purpose, a phenomenological damage model was modified and implemented as a user material in ABAQUS. It was hypothesized that all input parameters could be determined from a suitable high-speed test program. Therefore, novel impact test device was designed, developed and integrated into a drop tower. Drop tower tests with different impactor masses and impact velocities at different bumper bracket configurations were conducted to compare the numerically predicted deformation and damage behavior with experimental evidence. Good correlations between simulations and tests were found, both for the global structural deformation, including fracture, and local damage entities in the impact zone. It was proven that the developed phenomenological damage models can be fully applied for present-day industrial problems.
Highlights
Engineering with novel, light-weight, high-performance composite materials has been a focus of science and many different industrial sectors in recent years due to increasing requirements for the reduction of climate-damaging emissions and economizing the use of fossil energy sources.In this context, textile-reinforced composites offer enormous lightweight potential [1,2]
In order to improve the lightweight potential of braided bumper brackets in the future, the scientific goals of this study are: (a) to describe the impact behavior using, for the first time, novel, specially adapted, phenomenological continuum damage mechanics (CDM) models that have been implemented into commercial finite element codes, (b) to characterize the impact performance of the bumper brackets experimentally by drop tower tests that were specially designed for this study, and (c) to evaluate the capabilities of the models, both with respect to mechanical correctness and practicability for industrial use
The damage the damage phenomenology of the bumper bracket reinforced with both biaxial braids and separately shown pictures of the front, lateral and back side of the bumper bracket illustrate that the separately shown pictures of the front, lateral and back side of the bumper bracket illustrate that the triaxial braids can be reproduced significantly well
Summary
Engineering with novel, light-weight, high-performance composite materials has been a focus of science and many different industrial sectors in recent years due to increasing requirements for the reduction of climate-damaging emissions and economizing the use of fossil energy sources. In this context, textile-reinforced composites offer enormous lightweight potential [1,2]. Textile-reinforced composites offer enormous lightweight potential [1,2] Beyond that, they feature highly specific stiffnesses and strengths [3,4], as well as a high energy absorption capabilities during crash and impact loading, and are suitable for dynamically loaded, high-performance structures. The development of suitable simulation techniques and material models for different types of textile
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