Analysis of a pin-loaded viscoplastic plate

doi:10.1016/0045-7949(95)00022-9

Computers & Structures

Volume 56, Issues 2–3, 17 July 1995, Pages 295-302

https://doi.org/10.1016/0045-7949(95)00022-9 Get rights and content

Abstract

An experimental program has been initiated to measure the response of Timetal^®21S plates and SCS-6/Timetal^®21S metal matrix composite (MMC) plates monotonically loaded through a pinned connection at high temperature. A coordinated analytical effort has also been started to model these experiments using the ADINA finite element package and a modified version of the user-defined material module of Kroupa (1993) which incorporates a Bodner-Partom viscoplastic model. Results are presented for the first part of this analytical study, which considered the response of monolithic Timetal^®21S plates in order to determine the importance of various factors for incorporation into more complex analysis of the MMC plates. Studies were conducted to assess the viability of efficient approximate boundary conditions; the importance of residual thermal stresses induced during heat up prior to mechanical loading; and the accuracy of the material model. Results indicate that detailed modeling of the pin-plate contact surface is required to achieve high accuracy; thermal residual fields in the plate and pin may be neglected; and refinement of the constitutive model is required for improved accuracy.

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Effects of stacking sequence and clamping force on the bearing strengths of mechanically fastened joints in composite laminates
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The weakest parts of a composite laminate structure are often the joints. Hence the need to design reliable and efficient load-carrying joints has become increasingly important and the effects of stacking sequence and clamping force on joint strengths have to be clarified. In this study, the effects of stacking sequence and clamping force on delamination bearing strength and ultimate bearing strength of mechanically fastened joints (pinned and bolted) in carbon/epoxy composite laminates were examined using the acoustic emission (AE) technique. Two orthotropic and three quasi-isotropic laminate lay-up configurations and four clamping forces were examined. Based on the experiments, the effects of stacking sequence and clamping force on joint strengths were systematically investigated. Guidelines for effective stacking sequences and maximum clamping forces for mechanically fastened joints in composite laminates are suggested based on delamination bearing strength and ultimate bearing strength.
Bearing failure analysis of mechanically fastened joints in composite laminates
2001, Composite Structures
An experimental investigation was performed to study the effects of stacking sequence and clamping force on delamination bearing strengths of mechanically fastened joints in carbon/epoxy composite laminates using acoustic emission (AE) technique. The experimental work of the study was presented in [H.J. Park, Effects of stacking sequence and clamping force on the bearing strengths of mechanically fastened joints in composite laminates, Compos. Struct., submitted], and this paper summarizes the analytical work. The major focus of the analytical work was to develop an effective methodology for assessing the delamination bearing strength of joints in finite composite laminates in conjunction with an accurate three-dimensional contact stress analysis via an efficient quasi-three-dimensional finite element procedure based on layerwise theory. The contact phenomena and stress distribution in the vicinity of joints in composite laminates are investigated in detail. The delamination bearing failure strengths of mechanically fastened joints in composite laminates are predicted using modified Ye-delamination failure criterion based on layerwise finite element contact stress analysis. The effects of stacking sequence and clamping pressure are considered. The accuracy and applicability of the proposed methodology are confirmed by comparisons to the referenced experimental data and previous investigations.
Finite element/boundary element analysis of viscoelastic and viscoplastic problems A bibliography (1994-1996)
1997, Finite Elements in Analysis and Design
Finite element linear and nonlinear, static and dynamic analysis of structural elements: a bibliography (1992-1995)
1997, Engineering computations

View full text

Analysis of a pin-loaded viscoplastic plate

Abstract

Compos. Engng

Implementation of a nonisothermal unified inelastic strain theory into ADINA6.0 for a titanium alloy—user guide

USAF WL-TR-93-4005

Phenomenological modeling of hardening and thermal recovery in metals

J. Engng Mater. Technol.

Theory and modeling guide

ADINA R&D Inc. Report ARD 87-8

ADINA-IN Manual

ADINA R&D Inc. Report ARD 92-4

Nonisothermal material parameters for the Bodner-Partom model

The effects of pin elasticity, clearance and friction on the stresses in a pin-loaded orthotropic plate

J. Compos. Mater.