Change search
ReferencesLink to record
Permanent link

Direct link
Numerical verification of a procedure for calculation of elastic-constants in microcracking composite laminates.
SWEDISH INST. COMPOSITES.ORCID iD: 0000-0002-0307-8917
SWEDISH INST. COMPOSITES.ORCID iD: 0000-0001-8699-7910
1992 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 26, no 17, 2480-2492 p.Article in journal (Refereed) Published
Abstract [en]

In two recent papers Gudmundson and Ostlund have presented a simple to use theory for calculation of reduced thermoelastic constants in composite laminates with matrix cracks. The theory is valid for two- and three-dimensional laminates of arbitrary layups and is asymptotically exact for dilute and infinite microcrack densities. Furthermore, the theory is based solely on ply property data and matrix crack densities. No experimentally determined or unknown theoretical parameters are required. The theory predicts changes in all coefficients of the elastic stiffness and thermal expansion coefficient tensors. In previous papers the accuracy of the present theory has been investigated for cross ply laminates by comparisons to experimental results from the literature and two-dimensional finite element calculations. However, in order to become a powerful tool in the analysis of cracked composite laminates the theory must be verified at intermediate crack densities also for angle ply laminates. Unfortunately no useful experimental results for such laminates have been found in the literature and numerical methods must be considered for the verification. In the present paper the approximate theory is compared with three-dimensional finite element calculations of cracked thick [THETA, - THETA]M glass fiber reinforced epoxy laminates for a wide range of different matrix crack densities. The finite element calculations can be considered as exact for all crack densities within the present formulation, and errors are due only to the numerical algorithm. It is found that the dilute theory in combination with the theory for infinite crack densities to a surprisingly good accuracy cover all ranges of crack densities.

Place, publisher, year, edition, pages
1992. Vol. 26, no 17, 2480-2492 p.
Keyword [en]
thermomechanical constitutive theory, matrix cracking, transverse cracking, stiffness reduction, distributed damage
National Category
Materials Engineering Mechanical Engineering
URN: urn:nbn:se:kth:diva-25510DOI: 10.1177/002199839202601701ISI: A1992KF03800001OAI: diva2:358837
QC 20101025Available from: 2010-10-25 Created: 2010-10-25 Last updated: 2010-10-25Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Gudmundson, PeterÖstlund, Sören
In the same journal
Journal of composite materials
Materials EngineeringMechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 30 hits
ReferencesLink to record
Permanent link

Direct link