Fracture in PMMA notched specimens under compression – Experimental study

Elżbieta Bura , Łukasz Derpeński , Andrzej Seweryn

Abstract

This paper presents the results of experimental tests on PMMA plane specimens during compression loading and unloading. Notched specimens were used. They were weakened by various edge-notches: sharp V-notch (notch radius is close to zero), rounded V-notch (notch radius is approximately 1 mm) and U-notch with radius equal to 10 mm. Specimens had two thicknesses: 9.7 and 14.5 mm. All of the deformations and fracture processes were recorded by a high-speed PHANTOM camera, which was synchronized with an MTS testing machine. Device synchronization enabled the estimation of the fracture initiation point and time moment. Depends on shape of the notch, various fracture initiation points were indicated. Critical load values were obtained. Two types of crack were observed. Causes and fracture initiation moments were diagnosed. The first crack appears during loading stage as a result of contact stress caused by the closing notch surfaces (crack type A). The second one was caused by residual stress generated during the unloading stage (crack type B). Fracture evolution processes for each notch type were described.
Author Elżbieta Bura (FME)
Elżbieta Bura,,
- Faculty of Mechanical Engineering
, Łukasz Derpeński (FME / DMACS)
Łukasz Derpeński,,
- Department of Mechanics and Applied Computer Science
, Andrzej Seweryn (FME / DMACS)
Andrzej Seweryn,,
- Department of Mechanics and Applied Computer Science
Journal seriesPolymer Testing, ISSN 0142-9418, (N/A 100 pkt)
Issue year2019
Vol77
Pages1-14
Publication size in sheets0.65
Keywords in Englishcompression load, PMMA, U-notch, V-notch, Ductile fracture
ASJC Classification1605 Organic Chemistry; 2507 Polymers and Plastics
DOIDOI:10.1016/j.polymertesting.2019.105923
URL https://www.sciencedirect.com/science/article/pii/S0142941819304222
Internal identifierROC 19-20
Languageen angielski
LicenseJournal (articles only); published final; Other open licence; with publication
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 12-02-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.251; WoS Impact Factor: 2018 = 2.943 (2) - 2018=3.07 (5)
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