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INSTRUMENTED BENCHMARK FOR IN-SITU MONITORING OF COMPOSITE CONSOLIDATION THROUGH AUTOCLAVE

IP.com Disclosure Number: IPCOM000250310D
Publication Date: 2017-Jun-27
Document File: 3 page(s) / 14M

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique for in-situ monitoring of composite consolidation through autoclave is disclosed. The technique allows tracking real-time specific state variable of composite material system under typical autoclave processing condition of heat, pressure and vacuum in a safe manner. The technique monitors variation in laminate thickness, contact pressure distribution between part laminate and tool induced by matrix flow and squeeze out pressure gradient.

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INSTRUMENTED BENCHMARK FOR IN-SITU MONITORING OF COMPOSITE CONSOLIDATION THROUGH AUTOCLAVE

BACKGROUND

 

The present disclosure relates generally to composite manufacturing and more particularly to instrumented benchmark for in-situ monitoring of composite consolidation through autoclave.

Currently, the autoclave consolidation of composite under heat and pressure provides zero direct visual and limited indirect access to the part laminate during processing through thermocouple (TC), few pressure transducers and dielectric sensors. The operator has access only to the before and after state of the material system, once the processing is completed.

It would be desirable to have an efficient technique for in-situ monitoring of composite consolidation through autoclave.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts a custom made autoclave feed through gland.

Figure 2 depicts a custom made feed through gland accommodating 120 wires, high temperature blocks and sensor wires.

Figure 3 depicts a custom made feed through gland with sensors mounted on autoclave layup plate.

DETAILED DESCRIPTION

A technique for in-situ monitoring of composite consolidation through autoclave is disclosed. The technique allows tracking real-time specific state variable of composite material system under typical autoclave processing condition of heat, pressure and vacuum in a safe manner. The technique monitors variation in laminate thickness, contact pressure distribution between part laminate and tool induced by matrix flow and squeeze out pressure gradient.

The technique uses hermetically sealed linear variable differential transformer (LVDT) and high resolution film-like pressure mapping sensor in order to track variations in laminate thickness and pressure distribution, as depicted in figure 1. The LVDT is made up of stainless steel to withstand high temperat...