Abstract
The effects of laser-induced deconsolidation on the compaction process of CF/PEEK tapes were investigated. First, tapes with different degrees of deconsolidation were manufactured using a laser heater. This procedure resulted in samples with different waviness, thickness, void content and surface roughness values. Then, as-received and laser-deconsolidated tapes were compacted under two different temperature histories and four different pressure levels. Waviness induced by laser-deconsolidation vanished when the material was heated up to the glass transition temperature even at a very low compaction pressure. Unlike waviness; increased thickness, void content and surface roughness due to laser-deconsolidation remained between the glass transition and melting temperatures. After the melting temperature was exceeded, the effects of laser-deconsolidation were dependent on the applied pressure and initial degree of deconsolidation. The final surface roughness, thickness and degree of effective intimate contact were affected by the degree of laser-deconsolidation when a compaction pressure of less than 300 kPa was applied.
Highlights
IntroductionLaser-assisted fiber placement (LAFP) with in-situ consolidation (without a post-consolidation step such as an autoclave, oven or press) has received an increasing attention from composite manufacturing community in the recent years [1]
Laser-assisted fiber placement (LAFP) with in-situ consolidation has received an increasing attention from composite manufacturing community in the recent years [1]
Unlike waviness; increased thickness, void content and surface roughness due to laser-deconsolidation remained between the glass transition and melting temperatures
Summary
Laser-assisted fiber placement (LAFP) with in-situ consolidation (without a post-consolidation step such as an autoclave, oven or press) has received an increasing attention from composite manufacturing community in the recent years [1]. The resulting part quality is highly dependent on the short (< 1 s) compaction phase of the process Several phenomena such as intimate contact development [3,4,5], void compression [6] and tape deformation [7] take place during the time spent under the compaction roller. These phenomena play a significant role in determining the final mechanical properties, dimensions and porosity of the structure [8,9]; it is crucial to have a deep understanding on the compaction behavior of the tape during LAFP [10]
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