F. DAMAGE TOLERANCE AND IMPACT
Presentation format to be decided
Experimental Determination Of The Torsional Residual Strength After
Impact Of Cfrp Tubes
G Minak, D Ghelli, A Zucchelli (Univ di Bologna)
In this paper the residual strength to torsion of carbon fibre reinforced plastics (CFRP) tubes,
of different lay-ups, after a low velocity lateral impact was experimentally measured and
compared with the resistance of undamaged tubes in order to develop suitable design criteria.
(IF7:1)
Comparision of Damage Characterization of Composite Laminates under
Quasi-Static Indentation and Low-Velocity Impact
Z Guan, Y Guo, Q Meng, D Liu (Beijing Univ)
Static and low-velocity impact tests and simulations were carried out in order to study the
damage mechanics of composite laminates. The results show that indentation-flexure test can
be used to measure damage resistance to a certain extent, and the impacted specimen
showed lower delamination areas for a given energy than the one in static test. (IF7:2)
Pinned Foam Core Sandwich for Improved Damage Tolerance of Racing
Multi-Hull Yachts
P Davies, D Choqueuse, B Bigourdan (IFREMER) N Baral (CDK Tech) D Cartié, I Partridge
(Cranfield Univ) Christophe Baley (Univ de Bretagne Sud)
This paper presents results from an experimental study of the damage tolerance of sandwich
panels for yacht structures. Comparison of results from impact tests on new pinned core foam
materials shows a threefold improvement in energy to first damage compared to currentlyused honeycomb panel of the same areal weight. (IF7:3)
Prediction of the Mechanical Properties of Shape Memory Alloy Hybrid
Woven Composites
S Angioni, M Meo (Univ of Bath) A Foreman (QinetiQ)
This paper presents a multiscale model for predicting the mechanical behaviour of Shape
Memory Alloy (SMA) hybrid composites with woven fabric reinforcements. The model is
validated against experimental results showing good correlation. This model is then used for
prediction and optimisation of the impact energy absorption of plates with different SMA
layout subjected to low velocity impact. (IF7:4)
An Experimental Study on the Impact Resistance of Glass-FiberReinforced Aluminum (Glare) Laminates
MA Ardakani, AA Khatibi Univ of Tehran) H Parsaiyan (Amirkabir Univ of Tech)
This paper investigates the impact resistance and damage characteristics of a range of Glare
laminates under low velocity impact loading. A series of impact tests, based on ASTM D7136
standard, with different energies were conducted on three types of Glare laminates, i.e.
Glare4/3, Glare3/2 and GlareWB3/2. In addition to single impacts, 10 and 20 successive
impacts were conducted in order to investigate the effect of repeated impacts. (IF7:5)
Delamination Control in Composite Plates Subjected to Low-Velocity
Impact Using Piezoelectric Sensors and Actuators
L Iannucci, MS Dawood, E Greenhalgh (Imperial College London) A Ariffin (National Univ
Malaysia)
Composite materials generally have poor tolerance to impact loads. Unlike metallic materials,
composite materials absorb impact energy through fracture processes such as matrix crack
and delamination. Utilizing cohesive based delamination models, the possibilities of using
piezoelectric materials for controlling delamination in composite plates subjected to low
velocity impact, are investigated. (IF7:6)
Predicting Compression-after-Impact Performance of Carbon Fibre
Composites Based on Impact Response
X Zhang (Cranfield Univ) A Brindle (Royal Australian Navy)
NEEDS 50 WORD ABSTRACT
(IF7:7)
A Numerical Approach for Low Energy Impacts on Composite Laminates
using Explicit FE Codes
A Baldi, A Airoldi, M Daleffe, G Sala (Politecnico di Milano) M Basaglia (Alenia – Aermacchi)
This paper presents a numerical approach to analyse tests carried out to predict the onset
and the development of interlaminar damage below the barely visible impact level. The
approach is presented and validated considering interlaminar fracture characterisation tests. It
is subsequently applied to impact on carbon fabric and UD specimens. (IF7:8)
The Effect of Indentor Geometry on the Indentation Resistance of
Auxetic Carbon Fibre Laminates
K Alderson (Univ of Bolton) V Coenen (The North West Composites Centre)
Carbon fobre laminates were produced with matched through-the-thickness modulus, but with
negative (auxetic), positive and near zero Poisson's ratios. These were then indented with
noses of diameter 2, 12.7 and 20mm. Enhamcements in indentation resistnce were seen for
the auxetic laminates with smaller, more localised damage areas. (IF7:9)