TY - JOUR
T1 - On the effect of flat energy directors thickness on heat generation during ultrasonic welding of thermoplastic composites
AU - Palardy, Genevieve
AU - Villegas, Irene Fernandez
PY - 2017/2/12
Y1 - 2017/2/12
N2 - This paper presents a detailed experimental assessment of the effect of the thickness of flat energy directors (ED) on heat generation at the interface during ultrasonic welding. Power and displacement data showed clear differences caused by the change of thickness, related to heat concentration at the weld line during the process. The extent of the heat-affected zone was assessed by welding specimens without consolidation at different stages of the process. It was confirmed through optical microscopy that heat is generated at the interface and transferred to the bulk adherends earlier in the process for thinner ED. The analysis of their fracture surface under optimum welding conditions revealed signs of matrix degradation, leading to less consistent quality, likely due to faster heat generation rate in both the ED and the substrates, and incidentally, higher temperatures surrounding the energy director.
AB - This paper presents a detailed experimental assessment of the effect of the thickness of flat energy directors (ED) on heat generation at the interface during ultrasonic welding. Power and displacement data showed clear differences caused by the change of thickness, related to heat concentration at the weld line during the process. The extent of the heat-affected zone was assessed by welding specimens without consolidation at different stages of the process. It was confirmed through optical microscopy that heat is generated at the interface and transferred to the bulk adherends earlier in the process for thinner ED. The analysis of their fracture surface under optimum welding conditions revealed signs of matrix degradation, leading to less consistent quality, likely due to faster heat generation rate in both the ED and the substrates, and incidentally, higher temperatures surrounding the energy director.
KW - energy directors
KW - mechanical properties
KW - optical microscopy
KW - plastic ultrasonic welding
KW - Thermoplastic composites
UR - http://www.scopus.com/inward/record.url?scp=84975138850&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:1b0732a2-f1ad-40c1-93c6-19d21320b4b2
U2 - 10.1080/09276440.2016.1199149
DO - 10.1080/09276440.2016.1199149
M3 - Article
AN - SCOPUS:84975138850
SN - 0927-6440
VL - 24
SP - 203
EP - 214
JO - Composite Interfaces (Print)
JF - Composite Interfaces (Print)
IS - 2
ER -