Variations of Fracture Strength, Crack Velocity and Fracture Surface Marks due to the Design of a Single Edge Notched Tensile Specimen : In the Case of Unsaturated Polyester Resin
Memoirs of the Faculty of Engineering, Yamaguchi University Volume 39 Issue 1
Page 83-92
published_at 1988
Title
片側き裂付き引張試片の設計による破壊強度, き裂速度および破面模様の変化 : 不飽和ポリエステル樹脂の場合
Variations of Fracture Strength, Crack Velocity and Fracture Surface Marks due to the Design of a Single Edge Notched Tensile Specimen : In the Case of Unsaturated Polyester Resin
Source Identifiers
Brittle fracture strength and crack propagation velocity change with the design factors of a single edge notched tensile specimen, for example, the length to width ratio (L/W), the location and number of the loading pins, crack length (C_<01>) and its tip radius (ρ). Fracture strength shows a little change with an decrease in L/W when sharp tip radius specimens tensioned by two-bolts at near the left-side edge and it shows the notable change of strength when specimens tensioned by a pin. The specimens having the radius of 0.5mm, tensioned by a pin, show a strong effect of L/W compared with above two. Fracture strength in this case, of course, is larger than the former two cases. Fracture strength of those having a saw-cut tip decreases as the L/W decreases and the effect of L/W seems to be obvious. The measured crack velocity is genarally larger the larger the fracture strength. The crack propagates very slowy (at the order of mm/sec.) for the small L/W specimens of sharp tip radius and it does very quickly (at the order of m/s) for the large L/W ones. The crack velocity of specimens having a saw-cut tip reaches to the maximum of about 600m/s and it decreases as the crack propagates. The fracture surface marks of both end closed mark (like an ellipse) and one end opened mark (like a parabola) are observed on the saw-cut tip specimens and the crack arrest-lines dominates in specimens having a sharp tip radius. Detailed analysis of those marks are given.
Languages
jpn
Resource Type
departmental bulletin paper
Publishers
山口大学工学部
Date Issued
1988
File Version
Version of Record
Access Rights
open access
Relations
[ISSN]0372-7661
[NCID]AN00244228
Schools
工学部