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How coupon and element tests reduce conservativeness in element failure prediction
2014
Reliability Engineering & System Safety
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A key question, addressed here, is what weight penalty is associated with this conservativeness and how much it can be reduced by using coupon and element tests. ...
In this paper, a probabilistic approach is used to estimate the conservative element failure strength by quantifying uncertainty in the element strength prediction. ...
Increasing the number of coupon tests can reduce the uncertainty in the coupon test, and the uncertainty in the failure theory can be reduced by increasing the number of element test. ...
doi:10.1016/j.ress.2013.10.012
fatcat:3jo3i5ddvfht5fsgzcpakqb2rm
Effects of Structural Tests on Aircraft Safety
2010
AIAA Journal
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uses coupon test data to predict structural failure. ...
In particular, the paper focuses on the effect of the number of coupon tests and structural element tests on the final distribution of failure stress. ...
The authors also wish to thank graduate students Deepti Buchi and Sriram Pattabhiraman of the University of Florida for their work on the Johnson distribution and the quantiles. ...
doi:10.2514/1.j050202
fatcat:gcjqnqjnk5bz3oljczg5qkswwe
Being Conservative with a Limited Number of Test Results
2008
Journal of Aircraft
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In aircraft structural design, failure stresses are obtained from coupon tests and then used to predict failure under combined loads in structural elements. ...
It is a common practice to repeat the element tests and then select the lowest test result as a conservative estimate of the mean failure stress. ...
In aircraft structural design, failure stresses are obtained from coupon tests and then used to predict failure under combined loads in structural elements. ...
doi:10.2514/1.35551
fatcat:p6bn3c7f5zhavede33kgw44jt4
New design paradigms and approaches for aircraft composite structures
2018
Multiscale and Multidisciplinary Modeling Experiments and Design
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In this framework, the use of general-purpose software, in-house developed codes and dedicated testing approaches, have become part of an improved new building block and structural sizing approach, for ...
approaches aimed at reducing the conservativisms of the current design. ...
, and Professor Antonio Langella of University of Naples Federico II, for the execution of the mechanical tests. ...
doi:10.1007/s41939-018-0034-8
fatcat:ast6pnu7mfekxlyoezzzqlq3hm
Static and Fatigue Behaviour of Hexagonal Honeycomb Cores under In-plane Shear Loads
2011
Applied Composite Materials
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These results are also discussed in relation to the observed damage and failure modes which have been reported for the statically tested specimens and for the fatigue tested specimens at various stages ...
The results are further investigated using explicit non-linear finite element analysis to model the buckling failure mechanisms of the tested cores. ...
Open Access This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided ...
doi:10.1007/s10443-010-9184-5
fatcat:gk3gpwqxmfej3lrswpnetauu7y
Tensile material properties of human rib cortical bone under quasi-static and dynamic failure loading and influence of the bone microstucture on failure characteristics
[article]
2013
arXiv
pre-print
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The bone coupons were assumed isotropic, homogeneous and elastic linear, and the average Young's modulus for the quasi-static tests (13.5 GPa) and the failure stresses (quasi-static: 112 MPa, dynamic: ...
These finite element models can now capture small geometrical features with an attempt to predict fracture. ...
for sharing their expertise in bone coupon testing. ...
arXiv:1108.0390v2
fatcat:kr7y272t3bgpnbov7sgwmxk7hu
Local Flange Buckling in Plate Girders with Trapezoidal Corrugation of Web
2018
International Journal of Engineering Research and
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One of the issues raised since the steel structure was introduced in the construction industry is how to reduce the weight and cost of the component parts such as girder and beams. ...
The results predicted using codes, numerical analysis and experimental results are compared. Index Terms-(NAS), (DSM) ,trapezoidal corrugation, British standard I. ...
The basic concept behind the finite element analysis is that structure is divided into a finite number of elements having finite dimensions and reducing the structure having infinite degrees of freedom ...
doi:10.17577/ijertcon005
fatcat:xz5qyzkn3fesnmsizq4z3k2p7m
Finite Element Modelling of Cold Formed Stainless Steel Columns
2005
Acta Polytechnica
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Comparisons of the finite element results and the test results are also made with existing design specifications and conclusions are drawn on the basis of the comparisons. ...
Stress-strain curves derived from tests and design codes are incorporated into non-linear finite element analyses of eccentrically loaded columns and the results obtained are compared with those obtained ...
However, any differences between finite element predictions and test results are very slight and occur mainly for very short length columns. ...
doaj:7a948618a5ec470398df1291666537f5
fatcat:y4l4qabxmjdovpjdoucnvpnw2q
Resin treatment of free edges to aid certification of through thickness laminate strength
2016
Composite structures
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A linear FE method developed in this paper is conservative and predicts the strength of treated curved laminates to within 5% of the average test value. ...
This significantly reduces the edge effect and delays failure. The resin edge treatment increases the strength of the curved laminate test specimens by 16%. ...
ACKNOWLEDGEMENTS The authors would like to acknowledge the support of Jesper Ankersen (GKN Aerospace) and Vijay Sahadevan (GKN Aerospace). ...
doi:10.1016/j.compstruct.2016.02.074
fatcat:fmlrsf7xoffwdja7i7bof77l6q
Weibull analysis and area scaling for infrared windows
2017
Window and Dome Technologies and Materials XV
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The two parameter Weibull Equation 1 gives more conservative predictions of survival than a three parameter equation in which there is a lower stress limit below which the probability of failure is considered ...
FIGURE 1 . 1 Weibull Curve (Cumulative Probability of Failure) Fit to Observed Strengths (Failure Stress) of 10 Test Coupons. ...
doi:10.1117/12.2258537
fatcat:cy5uu4762zhhnkhsjfl7dowhay
Finite element modelling of composite structures under crushing load
2015
Composite structures
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It includes a more accurate determination of the characteristic length to achieve mesh objectivity in capturing intralaminar damage consisting of matrix cracking and fibre failure, a load-history dependent ...
The developed damage model requires a set of material parameters obtained from a combination of standard and non-standard material characterisation tests. ...
The virtual coupon was assigned with properties of T700/M21 obtained from the literature [60] [61] [62] [63] [64] and in-house testing. ...
doi:10.1016/j.compstruct.2015.05.008
fatcat:cacyr3pf6fhhbgcbdhrmybcefa
Compressive strength of delaminated aerospace composites
2012
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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These laminates were subsequently subject to experimental compression testing and nonlinear Finite Element Analysis (FEA) using cohesive elements. ...
Comparison of Strip model results with those from experiments indicates that the model can conservatively predict the strain at which propagation occurs to within 10% of experimental values provided (i ...
Hunt and David Lovell during preparation of the manuscript. The second and third authors are currently supported by the EPSRC (EP/H025898/1), Airbus Operations and GKN Aerospace. ...
doi:10.1098/rsta.2011.0339
pmid:22431756
fatcat:rcpvk5vznzdcngvdqyktuamkmq
Composite Materials Strength Determination Within the Current Certification Methodology for Aircraft Structures
2009
Journal of Aircraft
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Some examples of certification by analysis supported by test evidence as well as certification by test are given, and the fundamental differences are highlighted in the context of the building block philosophy ...
Although several composite failure criteria have been proposed over the years to predict the static strength of polymer composites, including micromechanical and first-ply failure theories, none of them ...
work and for their commitment to composite safety and certification. Undergraduate student researcher Enrique Galgana is gratefully acknowledged for generating the graphics. ...
doi:10.2514/1.41286
fatcat:5o5ga5oq3fdxvaxnv4t4nwoksu
Estimating S-N curves for local fiber dominated fatigue failure in ring specimens representing filament wound pressure vessels with damage
2021
Composites Part C: Open Access
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The local S-N curve was considerably less conservative than nominal S-N curves obtained from standard coupon testing. Its origin was a factor 2.5 higher. ...
This study shows how S-N curves can be measured that describe local fiber dominated fatigue failure on the scale of 0.25 mm near stress concentrations caused by a hole representing damage. ...
partners from research, industry and public sector. ...
doi:10.1016/j.jcomc.2021.100135
fatcat:4xkcfgi74zcfhgrhmh7cignb5e
Testing, simulation and design of cold-formed stainless steel CHS columns
2018
Thin-walled structures
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From the limited existing test data on stainless steel circular hollow sections (CHS) columns it has been observed that the current Eurocode 3 provisions can be unconservative in their capacity predictions ...
, 9 duplex and 11 ferritic stainless steel CHS column buckling tests and 10 stub column tests have been carried out. ...
authors would like to acknowledge the contribution of Gordon Herbert, Alfredo Olivo, Hayden Spektor and Joel Thomas at Imperial College London and Tomás García, Jordi Lafuente, Jordi Cabrerizo and Itsaso ...
doi:10.1016/j.tws.2018.05.006
fatcat:5twtlheb5fhsvnlnn3e4yz27ja
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