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INSTRUMENTED BENCHMARK FOR IN-SITU MONITORING OF COMPOSITE CONSOLIDATION THROUGH MATCHED DIE MOLDING

IP.com Disclosure Number: IPCOM000250277D
Publication Date: 2017-Jun-21
Document File: 5 page(s) / 233K

Publishing Venue

The IP.com Prior Art Database

Abstract

A technique for in-situ monitoring of composite consolidation through matched die molding is disclosed. The technique allows performing in-situ monitoring and characterization of composite laminate consolidation through matched die molding. The system mounted on a hydraulic universal testing machine, allows tracking real-time specific state variable of composite material system under typical matched die molding condition of heat, pressure and vacuum in a safe manner. The technique monitors variation in laminate thickness, contact pressure distribution between part laminate and tooling induced by matrix flow and squeeze out pressure gradient.

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INSTRUMENTED BENCHMARK FOR IN-SITU MONITORING OF COMPOSITE CONSOLIDATION THROUGH MATCHED DIE MOLDING

BACKGROUND

 

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

Currently, the autoclave consolidation of composite under heat and pressure provides zero direct visual and limited indirect access through thermocouple (TC), few pressure transducers and dielectric sensors to the part laminate during processing. 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 matched die molding.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 depicts an illustration of custom-made piston-cavity assembly mounted on a universal testing machine (UTM).

Figure 2 depicts an illustration of custom-made piston-cavity assembly mounted on a universal testing machine (UTM) with four force point sensors laid up on the cavity floor.

Figure 3 depicts an illustration of composite prepreg specimen being compacted by the piston against the four force point sensors.

Figure 4 depicts all 4 locations of the force point sensors marked on the specimen surface.
 

DETAILED DESCRIPTION

A technique for in-situ monitoring of composite consolidation through matched die molding is disclosed.  The technique allows performing in-situ monitoring and characterization of composite laminate consolidation through matched die molding. The system mounted on a hydraulic universal testing machine, allows tracking real-time specific state variable of composite material system under typical matched die molding condition of heat, pressure and vacuum in a safe manner. The technique monitors variation in laminate thickness, contact pressure distribution between part laminate and tooling induced by matrix flow and squeeze out pressure gradient.

As depicted in figure 1, the technique uses a stainless steel piston-cavity assembly mounted on universal testing machine to track changes in laminate thickness, total load applied between part laminate and tooling induced by matrix flow. The linear variable differential transformer is used for displacement monitoring, whereas load cells are used for pressure or load monitoring.

Figure 1

In order to track changes in pressure distribution, four film-like force point sensors are mounted on the a...