The bottle-neck shaped seal of bags for holding liquid is particularly convenient for pouring the liquid into another container. In recent years, bags have frequently broken at the bottle-neck shaped seal because the bags were subjected to the impact during loading and unloading. Taking this into consideration, we performed impact tensile tests using two types of bags with bottle-neck shaped seals, one with barrier characteristics, i.e., laminate films of NY/alumina-evaporation PET/XA-S and NY/AL/XA-S, and one without barrier characteristics, i.e., NY/XA-S for bottle neck shaped seal diameters of 7.5, 10, 12.5, 13, 14, 15 and 20mm and flat seal bags. When the seal diameter of NY/aluminaevaporation PET/XA-S, NY/AL/XA-S or NY/XA-S is 15mm or greater, the impact tensile load at break is almost the same as that of flat seal bags.

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学界ニュース

2018年度C&C

：西森秀稔氏

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Ｊ

2022の募集開始 対象は番組、書籍、記事、展示など

　科学ジャーナリスト賞（JASTJ

）2022の候補作の募集を開始しました。今回で17回目を迎えました。

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　前号でお知らせしたように会報『JASTJ NEWS』は電子ジャーナルの仲間入りをしました。

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■第73・74期会長候補選挙の投票のお願い　■・助成等の募集予定一覧　■2015年12月1日付新入会者

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Stress intensity factor K_I in a rectangular plate with a crack is studied using the method of caustics when it is heated at one edge. It is shown that there arises a negative value of K_I in the plate with an artificial notch. In such a case, the method of caustics is very useful, because it is possible to easily know whether the value of K_I is positive or negative through the type of optical system of caustics used and the shape of caustic pattern obtained. Theoretical caustic patterns are illustrated for various cases of an optical system, positive and negative values of K_I and optical property of the material. It is shown that the value of thermal stress intensity factor varies from a positive one for a natural crack to a negative one for an artificial notch with width of 0.4mm by using epoxy resin plate. These results revealed experimentally are discussed by comparing them with those obtained using FEM analysis, in which a modified technique is employed for a plate with a natural crack.

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Methods are proposed for multiplying the original fringes obtained from a photoelastic experiment and extracting the fringes using the original-or multiplied-fringe image. The multiplication method is based on the trigonometric identity of the double and triple relations of the sine and cosine functions. The extraction method utilizes two image obtained in dark-and light-field circular polariscope. In order to investigate the accuracy of the measurement, a computer simulation is used for the theoretical fringes in a circular disk subjected to a concentrated. Continuous photoelastic fringes near the crack tip are accurately extracted. This method is applied to an epoxy resin plate with a crack at one side 3-point bending and the stress intensity factor is calculated. The stress intensity factor is obtained accurately using multiplied fringes.

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kn-abstract=

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科学を実利的な道具としてだけではなく、文化としてとらえてほしいと強く願う。科学にとって「センス・オブ･ワンダー」は重要なモチベーションのひとつだ。そして、科学も芸術も、創造の根源には多くの共通点がある。

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