2026-05-24T11:13:49Zhttps://keep.lib.asu.edu/oai/requestoai:keep.lib.asu.edu:node-1481322024-12-19T19:04:43Zoai_pmh:alloai_pmh:repo_items148132
https://hdl.handle.net/2286/R.I.63561
http://rightsstatements.org/vocab/InC/1.0/
2021-05
42 pages
eng
Ryder, Chandler
Rajan, Subramaniam
Khaled, Bilal
Neithalath, Narayanan
Mechanical and Aerospace Engineering Program
Barrett, The Honors College
Text
Laminated composites are increasingly being used in various industries including <br/>automotive and aerospace. Under a variety of extreme loading conditions such as low and <br/>high-velocity impacts and crash, laminated composites delaminate. To understand how and<br/>when delamination occurs, two types of laboratory tests are conducted - End-notched <br/>Flexure (ENF) test and Double Cantilever Beam (DCB) test. The ENF test is designed to <br/>find the mode II interlaminar fracture toughness, and the DCB test, the mode I interlaminar <br/>fracture toughness. In this thesis, thermopressed Honeywell Spectra Shield® 5231 <br/>composite specimens made of ultra-high molecular weight polyethylene (UHMWPE), <br/>manufactured under two different pressures (3000 psi and 6000 psi), are tested in the <br/>laboratory to find its delamination properties. The test specimen preparation, experimental <br/>procedures, and data reduction to determine the mode I and mode II interlaminar fracture <br/>properties are discussed. The ENF test results show a 15.8% increase in strain energy <br/>release rate for the 6000 psi specimens when compared to the 3000 psi specimens. <br/>Conducting the DCB tests proved to be challenging due to the low compressive strength <br/>of the material and hence required modifications to the test specimens. An estimate of the <br/>mode I interlaminar fracture toughness was found for only two of the 6000 psi specimens.
Delamination
UHMWPE
Composite
DCB and ENF Testing to Determine Interlaminar Fracture Properties of Honeywell Spectra Shield® 5231 Composite