Impact and Post-impact Analysis on Engineered Composites

2021 ◽  
pp. 87-106
Author(s):  
Sunil Chandrakant Joshi ◽  
Yi Di Boon
Keyword(s):  
Impact Analysis ◽  
Post Impact

scholarly journals Post-Impact Investigation of CFRP Laminated Plate

2014 ◽  
Vol 71 (2) ◽  
Author(s):  
H.A Israr ◽  
N. Hongkarnjanakul ◽  
S. Rivallant ◽  
C. Bouvet
Keyword(s):  
Impact Analysis ◽  
Image Correlation ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Cfrp Laminates ◽  
Static Indentation ◽  
Indentation Tests ◽  
Post Impact ◽  
Carbon Fibre Reinforced Plastic ◽  
Delamination Area

This paper deals with low-velocity impact and quasi-static indentation tests on carbon fibre reinforced plastic (CFRP) laminates that classically used in aeronautical applications. The aim is to carry out post-impact analysis using Vic 3-D digital image correlation to investigate the behaviour of permanent indentation which is an important condition for the damage tolerance justification in composite. Result shows the indentation depth decreased with the time due to relaxation of the specimen until at certain position. The microscopic observations were carried out to understand the phenomenon.  Besides that, the post-mortem analyses on the impacted plate were also carried out through microscopic observation to determine the delamination area at each interface which is normally difficult to extract from the C-Scan result. The observations were made at three different sections cut (0°, 90° and 45°). The results of delamination area obtained from both microscopic and C-scan analysis is compared and there are rather satisfying to each other.

scholarly journals Introducing pre-impact air-cushioning effects into the Wagner model of impact theory

2021 ◽  
Vol 129 (1) ◽  
Author(s):  
Matthew R. Moore
Keyword(s):  
Impact Analysis ◽  
Initial Conditions ◽  
Liquid Pool ◽  
Wagner Model ◽  
Viscous Forces ◽  
Effective Contact ◽  
Impact Theory ◽  
General Power ◽  
Post Impact ◽  
The Impact

AbstractIn this analysis, we consider the effects of non-quiescent initial conditions driven by pre-impact air–water interactions on the classical Wagner model of impact theory. We consider the problem of a rigid, solid impactor moving vertically towards a liquid pool. Prior to impact, viscous forces in the air act to deform the liquid free surface, inducing a flow in the pool. These interactions are then incorporated as initial conditions in the post-impact analysis. We derive expressions for the size of the effective contact set, the leading-order pressure and force on the impactor, and the speed and thickness of the jet at its base. In all cases, we show that the effect of the pre-impact behaviour is to cushion the impactor, reducing the size of the effective contact set and, hence, the force on the impactor. Small- and large-time asymptotic solutions are derived for general power-law impactors, and we show that the effects of the air die away as the impact progresses, so that we approach the classical Wagner solution.

scholarly journals Vehicle Impact Analysis of Flexible Barriers Supported by Different Shaped Posts in Sloping Ground

2014 ◽  
Vol 6 ◽  
pp. 705629 ◽  
Author(s):  
Dong W. Lee ◽  
Jae S. Ahn ◽  
Kwang S. Woo
Keyword(s):  
Impact Analysis ◽  
Dynamic Performance ◽  
Risk Index ◽  
The Finite Element Method ◽  
Safety Behavior ◽  
Sloping Ground ◽  
Impact Performance ◽  
Vehicle Impact ◽  
Post Impact ◽  
Flexible Barriers

A roadside guardrail may be constructed near slopes. The desired safety behavior is ensured not only by the guardrail structure itself, but also by the interaction between soil and guardrail post. In the case of horizontal ground, the elastic Winkler spring model and the p- y curve approach can be used to estimate the soil-post interaction by the finite element method. However, it is difficult to apply those models with the sloping ground cases unless sufficient experimental data are given through the single post impact tests. This paper evaluates, using LS-DYNA software, the vehicle impact performance of flexible barriers made of steel W-Beam guardrails in sloping ground that are also supported over three different types of post configurations. The dynamic performance is tested in terms of maximum deflection, absorbing impact energy, and occupant risk index according to post types.

scholarly journals Droplet impact on water layers: post-impact analysis and computations

2005 ◽  
Vol 363 (1830) ◽  
pp. 1209-1221 ◽  
Author(s):  
R Purvis ◽  
F.T Smith
Keyword(s):  
Surface Tension ◽  
Impact Analysis ◽  
Water Layer ◽  
Droplet Impact ◽  
Good Correspondence ◽  
Water Layers ◽  
Small Times ◽  
Post Impact

An inviscid model of droplet impact into a water layer is examined analytically for small times just after impact and computationally for order-one distortion times. Various layer depths are considered, as are surface-tension effects. Good correspondence is found between analysis, computation and experiments.

Adverse Impact Analysis: Contemporary Perspectives and Practices

2011 ◽  
Author(s):  
Eric M. Dunleavy ◽  
Nancy T. Tippins ◽  
Frederick L. Oswald
Keyword(s):  
Impact Analysis ◽  
Adverse Impact

Integrated Traffic Impact Analysis Process for Urban Renewal

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Yanli Wang ◽  
Hao Sun ◽  
Sicheng Hao ◽  
Bing Wu
Keyword(s):  
Urban Renewal ◽  
Impact Analysis ◽  
Analysis Process ◽  
Traffic Impact
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