University of Twente Student Theses
Towards a testing standard for intralaminar fracture toughness of CFRPs : Determining the longitudinal Mode I intralaminar fracture toughness and crack growth consistency of a Continuous Fiber Reinforced Polymer with a Linear Elastic Fracture Mechanics (LEFM) approach.
Uil, D. (2023) Towards a testing standard for intralaminar fracture toughness of CFRPs : Determining the longitudinal Mode I intralaminar fracture toughness and crack growth consistency of a Continuous Fiber Reinforced Polymer with a Linear Elastic Fracture Mechanics (LEFM) approach.
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| Abstract: | A failure mechanism, related to delamination failure in CFRPs, is longitudinal intralaminar cracking which usually follows the extent of delamination. Though the mechanical characterization of delamination is well described and even supported by standard testing methods, that of the longitudinal intralaminar cracking is not. The objective of this research is to propose a testing method and protocol for the experimental evaluation of Mode I longitudinal intralaminar fracture toughness and crack propagation resistance of CFRPs under quasi-static loading. Several test setups were analyzed for their suitability and repeatability whereafter a SENB setup was chosen. Furthermore, the applicability of a LEFM approach has been researched, whereafter ISO 13586 was taken as guideline. Experimental methods have resulted in recommendations for: specimen machining, pre-crack cutting using a microtome and pre-crack depth. Furthermore, the determination of crack propagation resistance was done using an energy analysis and CBT method. Ten specimens were tested on fracture toughness as part of a Round Robin. The results, containing low variance, show a good repeatability of the test methodology used. The used method for pre-crack cutting and chosen pre-crack depth resulted in sharp crack tips and a seemingly low fracture toughness, more closely resembling a naturally occurring crack. |
| Item Type: | Essay (Master) |
| Clients: | Unknown organization, Netherlands |
| Faculty: | ET: Engineering Technology |
| Programme: | Mechanical Engineering MSc (60439) |
| Link to this item: | https://purl.utwente.nl/essays/97210 |
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