[PDF] Thermally-Assisted Piercing (TAP) to form holes in thermoplastic









[PDF] Thermally-Assisted Piercing (TAP) to form holes in thermoplastic

Industrial Member Report Summary – Key Findings for Industry Development of a Thermally-Assisted Piercing (TAP) Process for Forming Holes in
member report summary


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216843[PDF] Thermally-Assisted Piercing (TAP) to form holes in thermoplastic

Web: www.twi.co.uk Phone: +44 (0)1223 899000 Email: twi@twi.co.uk Copyright ©2015 TWI Ltd. All rights reserved. Industrial Member Report Summary ± Key Findings for Industry Development of a Thermally-Assisted Piercing (TAP) Process for Forming Holes in

Thermoplastic Composites TWI Core Research Programme Authors: Nick Brown and Chris Worrall

Industrial need

Machining of composites is a complex issue due to the heterogeneous material composition and the impact this has

on tool wear, tolerances and the resulting mechanical performance of the part. The majority of machining processes

adopted by industry cut the reinforcing fibres and remove material ± hindering structural performance and possible

weight savings.

Thermally-Assisted Piercing (TAP) is a material displacement process that can be used to displace fibres while forming

a hole in Thermoplastic Composites (TPCs) at various stages of manufacture or subsequent processing. The aim of

this study was to iden tify key mat erial micro-structures afte r piercing and how th ey affected the mechanical

performance of pierced composites, compared with conventionally drilled composites.

Key findings

"The micro structural architecture af ter piercing was significantly different to that of both a drilled specimen, and the parent material. "Open-hole tension an d compression strengt hs were higher for pie rced spe cimens when compared with drilled specimens. "The pierced specimens showed a reduction in pin and bolted bearing strength when compared with drille d specimens.

"Digital Image Correlation (DIC) results suggested thatthe resul tant material architect ure, created wh enpiercing, reduces the concentration of strains caused by

the hole and increases open-hole performance.How to benefit from this work "As an Industrial Member of TWI, you have free access

to the full report"If yo u are not an I ndustrial M embe r of TWI, find out how you r company coul d benefit from Membershi p

www.twi.co.uk/membership"Find out about a related follow on CRP project that is developing the technol ogy furth er for more specific industrial application "Contact chris.worrall@twi.co.uk to learn more.(a) (b)

Pierced holes (using the TAP process):

(a) Photograph of hole; (b) X-ray image of hole.Member Report Number: 1062/2015

TAP rig with pierced

composite laminate.

Web: www.twi.co.uk Phone: +44 (0)1223 899000 Email: twi@twi.co.uk Copyright ©2015 TWI Ltd. All rights reserved. Industrial Member Report Summary ± Key Findings for Industry Development of a Thermally-Assisted Piercing (TAP) Process for Forming Holes in

Thermoplastic Composites TWI Core Research Programme Authors: Nick Brown and Chris Worrall

Industrial need

Machining of composites is a complex issue due to the heterogeneous material composition and the impact this has

on tool wear, tolerances and the resulting mechanical performance of the part. The majority of machining processes

adopted by industry cut the reinforcing fibres and remove material ± hindering structural performance and possible

weight savings.

Thermally-Assisted Piercing (TAP) is a material displacement process that can be used to displace fibres while forming

a hole in Thermoplastic Composites (TPCs) at various stages of manufacture or subsequent processing. The aim of

this study was to iden tify key mat erial micro-structures afte r piercing and how th ey affected the mechanical

performance of pierced composites, compared with conventionally drilled composites.

Key findings

"The micro structural architecture af ter piercing was significantly different to that of both a drilled specimen, and the parent material. "Open-hole tension an d compression strengt hs were higher for pie rced spe cimens when compared with drilled specimens. "The pierced specimens showed a reduction in pin and bolted bearing strength when compared with drille d specimens.

"Digital Image Correlation (DIC) results suggested thatthe resul tant material architect ure, created wh enpiercing, reduces the concentration of strains caused by

the hole and increases open-hole performance.How to benefit from this work "As an Industrial Member of TWI, you have free access

to the full report"If yo u are not an I ndustrial M embe r of TWI, find out how you r company coul d benefit from Membershi p

www.twi.co.uk/membership"Find out about a related follow on CRP project that is developing the technol ogy furth er for more specific industrial application "Contact chris.worrall@twi.co.uk to learn more.(a) (b)

Pierced holes (using the TAP process):

(a) Photograph of hole; (b) X-ray image of hole.Member Report Number: 1062/2015

TAP rig with pierced

composite laminate.