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博士論文
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Dynamics of Crack-Growth in Filled Elastomers
- 国立国会図書館永続的識別子
- info:ndljp/pid/11239201
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一般注記:
- The characterization and understanding of the crack-growth in elastomers have been an important issue both in polymer physics and industrial rubber pr...
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デジタル
- 資料種別
- 博士論文
- 著者・編者
- Morishita, Yoshihiro
- 出版年月日等
- 2017-03-24
- 出版年(W3CDTF)
- 2017-03-24
- 並列タイトル等
- フィラー充填エラストマーのき裂進展挙動
- 授与機関名
- 京都工芸繊維大学
- 授与年月日
- 2017-03-24
- 授与年月日(W3CDTF)
- 2017-03-24
- 報告番号
- 甲第829号
- 学位
- 博士(工学)
- 博論授与番号
- 14303甲第829号
- 本文の言語コード
- eng
- 件名標目
- 一般注記
- The characterization and understanding of the crack-growth in elastomers have been an important issue both in polymer physics and industrial rubber products. In this thesis, two characteristic phenomena are investigated experimentally and analyzed while focusing on the effects of nonlinearity in elasticity and/or viscoelasticity: (1) the crack-growth rate v transition between two distinct regions of the slow mode and fast mode with the small change in the input tearing energy Γ, and (2) a power-law relationship between v and Γ in the fast mode region. The types of rubber and filler, concentrations of filler Φf and cross-link cx, and temperature T are extensively varied in order to change the degree of nonlinearity in elasticity of the elastomers. The shapes of crack-tip are characterized by two specific parameters, i.e., the deviation δ from the parabolic shape expected by linear elastic fracture mechanics (LEFM) and the parabolic curvature a. The Γ dependences of δ and a are successfully explained by weakly nonlinear elasticity theory of dynamic fracture (WNLT), which considers the second-order nonlinear effect in elasticity to LEFM, unless δ exceeds a limit value δc, independently of the types of rubber and filler, Φf, cx, and T. The value of δc depends on types of rubber and filler, whereas it is independent of Φf, cx, and T. The magnitude of the threshold tearing energy Γc for the onset of the crack-growth rate transition shows a good correlation with the fracture toughness Wc reduced by μ(1)3/μ(2)2 (μ(1): linear shear modulus, μ(2): second-order shear modulus), which is a measure of the nonlinearity in elasticity in WNLT. This result indicates that Γc is governed by the combined effect of the degree of nonlinearity in elasticity and the fracture toughness. A power-law relationship between v and Γ, i.e., Γ ~ vα, is also investigated. We find a universal relation between α and the exponent κ of the stress relaxation function G(t) ~ t-κ in the glass-rubber transition regime in linear viscoelasticity. The relation between α and κ is successfully explained by the existing theories which consider the contribution of linear viscoelasticity to LEFM for elastomers with low Φf and high cx, whereas that for elastomers with higher Φf and lower cx exhibits a finite deviation from the theoretical expectation.
- 国立国会図書館永続的識別子
- info:ndljp/pid/11239201
- コレクション(共通)
- コレクション(障害者向け資料:レベル1)
- コレクション(個別)
- 国立国会図書館デジタルコレクション > デジタル化資料 > 博士論文
- 収集根拠
- 博士論文(自動収集)
- 受理日(W3CDTF)
- 2019-02-03T04:35:56+09:00
- 記録形式(IMT)
- application/pdf
- オンライン閲覧公開範囲
- 国立国会図書館内限定公開
- デジタル化資料送信
- 図書館・個人送信対象外
- 遠隔複写可否(NDL)
- 可
- 掲載誌(URI)
- 連携機関・データベース
- 国立国会図書館 : 国立国会図書館デジタルコレクション