Structural designs for composite laminated systems can be optimized for a fail-safe in-service performance by introducing the built-in cumulative-damage-indicators for the progressive degradation of material properties. This design methodology is based on the concepts of the characteristic failure signature (CFS), cumulative-damage states and a load-drop sequence that characterize the stress-strain response and progressive accumulation of damage. The cumulative damage mechanics is based on the three-dimensional laminate analysis that is used to predict nonlinear response of composites, accumulation of damage and failure behavior. An earlier-developed nonlinear analysis involves an incremental formulation that couples the three-dimensional laminate analysis with a progressive ply-failure methodology, which has been tested in the World-Wide Exercise on Composites Failure Theories. The failure signatures are shown to have unique “safety features” that depend on the ply stacking sequence and predominant loading. To refine the analysis of micromechanical damage a model for the macro-to-micro coupling is introduced. Various examples of failure envelopes, characteristic failure signatures, a safety criterion and the “safe” CFSs that lead to the desired controlled failures are discussed for symmetric balanced laminates.

Issue Section:
Technical Papers
Keywords:
laminates, safety, finite element analysis, failure (mechanical), optimisation, stress-strain relations, fracture mechanics
Topics:
Composite materials, Damage, Failure, Laminates, Stress, Safety
1.
Chang, F.-K., ed., 2000, “Structural Health Monitoring 2000,” Proceedings 2nd Int. Workshop on Structural Health Monitoring, September 8–10, 1999, Stanford University, Stanford, CA.
2.
Tsai
,
S. W.
,
1984
, “
A Survey of Macroscopic Failure Criteria for Composite Materials
,”
J. Reinf. Plast. Compos.
,
3
, pp.
40
–
62
.
3.
Chamis, C. C., 1996, “Failure Criteria for Filamentary Composites,” Testing and Design, ASTM STP 490, American Society for Testing and Materials, West Conshohocken, PA, pp. 336–460.
4.
Ochoa, O., and Reddy, J. N., 1992, Finite Element Analysis of Composite Laminates, Kluwer Academic Publishers, Dordrecht, The Netherlands.
5.
Sun, C. T., Quinn, B. J., Tao, J., and Oplinger, D. W., 1996, “Comparative Evaluation of Failure Analysis Methods for Composite Laminates,” Technical Report DOT/FAA/AR-95/109, Washington, D.C.
6.
Soden
,
P. D.
,
Hinton
,
M. J.
, and
Kaddour
,
A. S.
,
1998
, “
A Comparison of the Predictive Capabilities of Current Failure Theories for Composite Laminates
,”
Compos. Sci. Technol.
,
58
(
7
), pp.
1225
–
1254
.
7.
Sleight, D. W., 1999, “Progressive Failure Analysis Methodology for Laminated Composite Structures,” NASA/TP-1999-209107, NASA Langley Research Center, Hampton, VA.
8.
Hinton, M. J., Kaddour, A. S., and Soden, P. D., 2001, “Predicting Failure in Fibre Composites: Lessons Learned from the World-Wide Failure Exercise,” Proceed. ICCM-13, July 11–13, Beijing, China.
9.
Bogetti, T. A., Harik, V. M., and Hoppel, C. P. R., 2000, “3D Analysis of Progressive Damage in Thick Composite Laminates,” Proc. 8th Int. Conf. Nuclear Engng., ICONE-8, Baltimore, 2–6 April; ASME CD, Philadelphia, PA, pp. 1–10.
10.
Bogetti
,
T. A.
,
Harik
,
V. M.
,
Hoppel
,
C. P. R.
,
Newill
,
J.
, and
Burns
,
B.
, 2003, “Prediction of the Nonlinear Response and Progressive Failure of Composite Laminates,” Compos. Sci. Technol., in press.
11.
Bogetti
,
T. A.
,
Hoppel
,
C. P. R.
,
Harik
,
V. M.
,
Newill
,
J.
, and
Burns
,
B.
, 2003, “Prediction of the Nonlinear Response and Progressive Failure of Composite Laminates: Correlation With Experimental Results,” Compos. Sci. Technol., in press.
12.
Harik
,
V. M.
,
2001
, “
Optimization of Structural Designs for a Safe Failure Pattern: Layered Material Systems
,”
Mater. Des.
,
22
(
4
), pp.
317
–
324
.
13.
Chou
,
P. C.
,
Carleone
,
J.
, and
Hsu
,
S. M.
,
1972
, “
Elastic Constants of Layered Media
,”
J. Compos. Mater.
,
6
, pp.
80
–
93
.
14.
Christensen, R. M., 1979, “Effective Moduli of Cylindrical and Lamellar Systems,” in Mechanics of Composite Materials, Wiley, New York, NY, pp. 73–105.
15.
Zienkiewicz, O. C., 1977, The Finite Element Method, 3rd ed., McGraw-Hill, London.
16.
O’Brien
,
T. K.
,
1985
, “
Interlaminar Fracture of Composites
,”
J. Aeronaut. Soc. India
,
37
(
1
), pp.
61
–
71
.
17.
Reifsnider, K. L., 1977, “Some Fundamental Aspects of the Fatigue and Fracture Response of Composite Materials,” Proc. 14th SES Annual Meeting, Bethlehem, PA.
18.
Dvorak
,
G. J.
, and
Laws
,
N.
,
1987
, “
Analysis of Progressive Matrix Cracking in Composite Laminates—ii First Ply Failure
,”
J. Compos. Mater.
,
21
, pp.
309
–
319
.
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