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THE EFFECT OF TOOLING MATERIAL, CURE CYCLE, AND TOOL SURFACE FINISH ON SPRING-IN OF AUTOCLAVE PROCESSED CURVED COMPOSITE PARTS
Viewed 306 times since Thu, Jan 5, 2012
The purpose of this paper is to demonstrate the effect that the tooling material, the tool-surface condition, and the cure cycle can have on the spring-in of curved composite laminates. A set of experiments was performed with T800H/3900-2 carbon... Read More
Spring In - Simulation in Fiber-Composite Manufacturing
Viewed 142 times since Sat, Jul 2, 2016
Fiber-composite materials are increasingly used for airframe structures. This is due to theirsuperior mechanical and mass characteristics compared to conventional materials, besidesother advantages. Special methods for predicting manufacturing... Read More
RESIDUAL STRESSES IN NON-SYMMETRICAL CARBON/EPOXY LAMINATES
Viewed 336 times since Thu, Dec 6, 2012
The curvature of unsymmetrical [0/90] laminates moulded from AS4/8552 uni-directional tape has been measured. A linear thermoelastic approach has been applied to predict the related residual stress state before demoulding, giving an estimate of the... Read More
RESIDUAL STRESS, SPRING-IN AND WARPAGE IN AUTOCLAVED COMPOSITE PARTS
Viewed 126 times since Sat, Jul 2, 2016
This paper presents an overview of residual stress build-up and shape distortions in autoclaved composite laminates. It discusses the sources of stress build-up and shape distortions and presents experimental results that identify... Read More
EFFECTS OF OUT-OF-PLANE PROPERTIES ON DISTORTIONS OF COMPOSITE PANELS
Viewed 674 times since Mon, Feb 13, 2012
Continuous-fibre-reinforced plastic products show shape distortions when they are released from the mould after forming at elevated temperatures. The residual stresses and the resulting spring-forward of a curved product can be modelled, but this... Read More
ANALYSIS TECHNIQUES FOR THE PREDICTION OF SPRINGBACK IN FORMED AND BONDED COMPOSITE COMPONENTS
Viewed 131 times since Sat, Jul 2, 2016
Two finite element analysis codes are used to model the effects of cooling on the dimensional stability of formed and bonded composite parts. The two analysis routines, one h-version and one p-verslon, are compared for modeling time,... Read More
A SENSITIVITY ANALYSIS OF FACTORS AFFECTING THE WARPAGE OF A COMPOSITE STRUCTURE
Viewed 254 times since Sun, Aug 16, 2015
Modelling of materials processes is a well-established methodology. Over the past two decades, a number of increasingly capable computational models for the autoclave processing of thermoset matrix laminated composite materials and structures have... Read More