PROBLEM TO BE SOLVED: To evaluate estimate durability performance by estimating fracture strength of a tire without sampling a rubber sample from a tire or performing a durability evaluation test, and to provide a highly durable tire.SOLUTION: A fracture-strength estimation method for a material includes: a first step of scanning a fracture surface of the material, measuring a position (X, y) and a height z(x, y) of the fracture surface, and digitizing a state of the fracture surface; a second step of calculating distances between respective positions using heights z of the position (x, y), a position (x+1, y), a position (x, y+1), and a position (x+1, y+1), and measurement intervals between the respective positions; a third step of calculating an area among four points using Heron's formula; and a step of determining whether or not a ratio obtained from surface roughness of the fracture surface and the measurement area is equal to or more than a threshold and estimating the fracture strength of the material.SELECTED DRAWING: Figure 1
【課題】タイヤからゴムサンプルを採取して耐久評価試験を行うことなく、タイヤの破壊強度を予測して耐久性能を評価すること、および、耐久性の高いタイヤを提供する。【解決手段】材料の破断面を走査し、破断面の位置(x,y)と高さz(x,y)を計測してこの破断面の状態を数値化する第1工程、位置(x,y)、位置(x+1,y)、位置(x,y+1)、位置(x+1,y+1)の高さzと各位置間の測定間隔を用いて各位置間の距離を算出する第2工程、ヘロンの公式を用いて4点間の面積を算出する第3工程、および破断面の表面粗さと測定面積から求められる比が閾値以上かどうかを判別することにより、材料の破壊強度を予測する。【選択図】図1
METHOD FOR ESTIMATING FRACTURE STRENGTH OF MATERIAL AND RUBBER COMPOSITION
材料の破壊強度の予測方法およびゴム組成物
2016-06-20
Patent
Elektronische Ressource
Japanisch
RUBBER COMPOSITION, RUBBER MATERIAL, USES THEREOF, AND ADDITIVE
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