tearing

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/06/30 11:34:40」(JST)

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For water from the eye, see Tears.

A torn sheet of paper

Tearing is the act of breaking apart a material by force, without the aid of a cutting tool. A tear in a piece of paper, fabric, or some other similar object may be the result of the intentional effort with one's bare hands, or be accidental. Unlike a cut, which is generally on a straight or patterned line controlled by a tool such as scissors, a tear is generally uneven and, for the most part, unplanned. An exception is a tear along a perforated line, as found on a roll of toilet paper or paper towels, which has been previously partially cut, so the effort of tearing will probably produce a straight line.

Materials vary in their susceptibility to tearing. Some materials may be quite resistant to tearing when they are in their full form, but when a small cut or tear is made, the material becomes compromised, and the effort needed to continue tearing along that line becomes less.

Materials can be characterized by standard methods to measure their 'tear strength'. There are several applicable standards which vary around the world. The variables which affect the tear strength can be summarized neatly by the quote:

"The value of tear strength obtained depends on the shape of the test piece, speed of stretching and temperature of test."

See also

• Screen tearing
• Cutting
• Deformation
• Ripstop

References

UpToDate Contents

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• 1. 持続性の流涙がみられる小児に対するアプローチ approach to the child with persistent tearing
• 2. ドライアイ dry eyes
• 3. 小児における鼻涙管閉塞（涙管閉鎖症） nasolacrimal duct obstruction dacryostenosis in children
• 4. 三叉神経・自律神経性頭痛の病態生理 pathophysiology of the trigeminal autonomic cephalalgias
• 5. 眼性酒さ ocular rosacea

English Journal

• Analgesic efficacy of intra-articular morphine after arthroscopic knee surgery in sport injury patients.

• Yari M, Golfam P, Saeb M.SourceDepartment of Anesthesia, Kermanshah University of Medical Sciences, Kermanshah, Iran. pgolfam@kums.ac.ir.
• Journal of injury & violence research.J Inj Violence Res.2013 Jul 1;5(2). doi: 10.5249/jivr.v5i2.303. [Epub ahead of print]
• BACKGROUND: Anterior Cruciate Ligament (ACL) tearing is a common injury among football players. The present study aims to determine the best single-dose of intra-articular morphine for pain relief after arthroscopic knee surgery that, in addition to adequate and long-term analgesia, leads to fewer s
• PMID 23281420

• Effect of return to overuse activity following an isolated supraspinatus tendon tear on adjacent intact tendons and glenoid cartilage in a rat model.

• Reuther KE, Thomas SJ, Sarver JJ, Tucker JJ, Lee CS, Gray CF, Glaser DL, Soslowsky LJ.SourceMcKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, 424 Stemmler Hall 36th Street and Hamilton Walk, Philadelphia, Pennsylvania.
• Journal of orthopaedic research : official publication of the Orthopaedic Research Society.J Orthop Res.2013 May;31(5):710-5. doi: 10.1002/jor.22295. Epub 2012 Dec 31.
• Rotator cuff tears are common conditions that can alter shoulder mechanics and may lead to damage of intact joint tissues. These injuries are of particular concern in populations who perform tasks requiring repetitive overhead activity (e.g., athletes and laborers) and who are likely to return to ag
• PMID 23280495

Japanese Journal

• 硫化物を分散させた鉛フリー青銅鋳物の金型鋳造における凝固割れ性

• 吉田 亮子,丸山 徹,阿部 弘幸,松林 良蔵,寺村 正和,小林 武,竹中 英俊
• 鋳造工学 = Journal of Japan Foundry Engineering Society 84(7), 383-388, 2012-07-25
• NAID 10030811116

• Neoclassical Tearing Mode Analysis in Spherical Tokamak Burning Plasmas

• KURITA Daiki,YAMAZAKI Kozo,ARIMOTO Hideki,OISHI Tetsutarou,SHOJI Tatsuo
• 電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society 132(7), 517-520, 2012-07-01
• … For stabilization of neoclassical tearing mode (NTM), non-resonant helical field (NRHF) is investigated. …
• NAID 10030777844

Related Links

• Tearing | Define Tearing at Dictionary.com

Tearing definition, shedding tears. See more. ... a drop of the saline, watery fluid continually secreted by the lacrimal glands between the surface of the eye and the eyelid, serving to moisten and lubricate these parts and keep them ...

• Tearing - definition of tearing by The Free Dictionary

Well, when the dark shut down, in the rugged hills, that poor little chap had been tearing around in the saddle all day, and I noticed by the slack knee-pressure that she was tired and tottery, and I got dreadfully afraid; but every time I ...

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