Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 74 for “"impact damage"”.
-
Impact damage behaviour of lightweight materials
Impact damage resistance is an essential requirement of lightweight structural components for high-performance applications. The aim of this thesis is to study the impact damage and perforation behaviour of lightweight materials including thin aluminium alloy plates and carbon fibre reinforced …
-
Modeling impact damage in laminated composite plates
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2003.
-
Impact damage response of graphite/epoxy fabric structures
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
-
Impact damage mechanisms in several laminated material systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
-
Simulation of low-velocity impact damage in sandwich composites
… of composites is their high susceptibility to impact-induced damage, which may result in significant strength reduction or even structural collapse. A detailed understanding of the extent and nature of impact damage is thus greatly needed for damage tolerance based structural design and a …
-
Self-healing of impact damage in vascular fiber-reinforced composites
… of a composite material after an out-of-plane impact event using vascular self-healing technologies. To date, the critical damage modes which occur during out-of-plane impact that most significantly contribute to reductions in post-impact performance have not been identified and methods for …
-
Impact Damage Resistance of Shape Memory Alloy Hybrid Composite Structures
… plates, which can be used for low velocity impact or quasi-static contact loading, are derived. The governing equations include the transverse shear deformation to the first-order, large deformation of the plates, and SMA/epoxy lamina. The equations are derived in the general form with …
-
Impact damage evaluation of high performance polymeric composite material systems
… in two parts. In Part I a nitrogen gas gun impact system developed at Virginia Polytechnic Institute and State University is described. Evaluation methods for impact damage resistance and impact damage tolerance as developed by K. T. Teh are presented as a basis for comparative analysis of …
-
Impact damage resistance and tolerance of advanced composite material systems
Experimental evaluations of impact damage resistance and residual compression strengths after impact are presented for nine laminated fiber reinforced composite material systems. The experiments employ a small scale specimen for assessing the impact damage resistance and impact damage tolerance of …
-
The Effect of Impact Damage on the Fatigue Life of Steel
… of the research was to investigate the effect of impact damage on the fatigue life of steel using both experimental and finite element methods. Any component that is subjected to a single impact may have not only noticeable surface damage, but also residual stresses in its surface and subsurface …
-
Effect Of Impact Damage On Compression-Compression Fatigue Behavior Of Sandwich Composites
… research work was to investigate the effect of impact damage on in-plane buckling and compression-compression fatigue behavior for a new sandwich structure made from E-glass/epoxy face sheets over end-grain balsa wood core. Low velocity impact tests were carried out using a drop-weight impact …
-
Detection and characterization of impact damage in carbon fiber aircraft fuselage structure
… continues to grow in the aviation industry, damage detection techniques need to be developed and tested. Impact damage on aluminum aircraft structures can be detected from obvious surface indications. This is not the case in composite aircraft structure. Large interply delaminations and …
-
Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
… but are particularly susceptible to transverse impacts. Impact can significantly reduce strength and the extent of damage can grow under cyclic loading conditions. Because this type of damage often occurs below the surface, hidden from inspection, it is especially critical in structural …
-
Residual Compressive Strength Prediction of Carbon/Epoxy Laminates Subjected to Low Velocity Impact Damage
<p>Low energy impact damage to a composite structure is difficult to detect and can have profound effects on compressive strengths. Low energy impact damage is sometimes termed as barely visible impact damage (BVID). Detecting BVID is only possible by implementing nondestructive testing (NDT) …
-
A Predictive Methodology for Soft Impact Damage in Jet Engines Incorporating Hybrid Composite Structures
… and composite structures, when subjected to soft impact. Bird strike onto the fan assembly is chosen as the impact event to be studied. The aim is to develop a numerical methodology capable of accurately capturing the full range of multifaceted damage in hybrid and composite structures as they …
-
First results on the assessment of impact damage of vegetables by means of the FEM approach
… post-harvest handling induce numerous mechanical impacts on vegetables. These impacts may cause damage such as black-spot bruise, resulting in severe economic losses. Impact forces and accelerations arising from collisions, are among the main indices taken into account when studying the damage of …
-
Projectile impact damage in filament wound CFRP tubes : effect of stacking sequence on projectile kinetic energy dissipation
… The laminates underwent projectile impact up to and beyond their ballistic limits and the significant damage mechanisms were then measured and their contribution to energy dissipation quantified. Instrumented drop tests were also performed in order to determine the normal laminate …
-
A self healing smart syntactic foam based grid stiffened sandwich structure
… gained immense importance as a lightweight and damage-tolerant material when used in foam-cored sandwich structures. Because of the structural-length scale damages by low velocity impact such as tool drops, runway debris etc., sandwich structures usually have a very low residual structural …
Page 1 of 4