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Methodology for residual strength of dynamically loaded composites

Gädke, M. (2000) Methodology for residual strength of dynamically loaded composites. 20th Anniversary of DLR - CAE Cooperation, Workshop on Aeronautical Sciences & Technologies, Berlin, June 13-14,2000.

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Abstract

In cooperation with the Aircraft Strength Research Institute of the Chinese Aeronautical Establishment (CAE) an analytical approach for modelling and calculation of the residual, strength of composites was developed during the past years in the Institute of Structural Mechanics. The main features of the approach are 1) an independent damage characterization method; 2) a new failure criterion for delamination damage; 3) a simple model for the prediction of impact damage, based on the bending strain energy density; and 4) an algorithm for the residual strength analysis of single and/or multiple delaminations, either introduced by impact or pre-implanted. The approach led to the development of a Windows compatible computer program, called "Composite Damage Tolerance Analysis Code (CDTAC)", which enables the calculation of the impact transient response, the impact damage and consequently the residual compressive strength of composite laminates, and, in an extended version, of stringer-stiffened composite panels. The comparison between calculated and experimentally evaluated impact damage zones as well as of the residual compressive strengths showed a good agreement of the results. In future work the extension of the program to the damage growth simulation under fatigue loading and the prediction of the residual strength after fatigue will be performed.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2000,
Title:Methodology for residual strength of dynamically loaded composites
Authors:
AuthorsInstitution or Email of Authors
Gädke, M.UNSPECIFIED
Date:2000
Status:Published
Event Title:20th Anniversary of DLR - CAE Cooperation, Workshop on Aeronautical Sciences & Technologies, Berlin, June 13-14,2000
Organizer:DLR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Institut für Strukturmechanik
Deposited By: Sibylle Wolff
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:00

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