Effect of Higher Order Terms on Measurement of Dynamic Stress Intensity Factor with Caustic Method

高阶项对苛性碱法动态应力强度因子测量的影响

• 批准号: 05650079
• 负责人: SUZUKI Shinichi
• 金额: $ 1.34万
• 依托单位: Toyohashi University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650079/
• 关键词: Fracture Mechanic; Brittle Fracture; Impact Strength; Fracture Toughness; Material Testing; Caustic Method; Interferometry; Pulsed Holographic Microscopy; 破壊靱性

[1] Crack tip stress fields of cracks which were being propagated at a speed of about 550m/s were measured at the time of 18 or 73 microsecons after the crack initiation, with holographic caustic method and pulsed holographic microscopy. The following results were obtained.(i) In the direction along a crack, effect of higher orber terms doesn't appear either at 18 or at 73 microseconds after the crack initiation, and the singular field is developed as far as 9mm from the crack tip. Hence, measurement of crack opening displacement always gives the true value of dynamic stress intensity factor.(ii) In the direction of 72 degrees from the crack propagation direction, effect of higher order terms appears at the time of 18 microseconds after the crack initiation. But it disappears at 73 microseconds, and the singular field is developed as far as 5mm from the tip.[2] Crack tip stress fields were measured also with a method of interferometry, and the same results as the above were obtained.[3] It can consequently be said that the higher order terms affect the measurement of dynamic stress intensity factor with the caustic method if the measurement is carried our within several ten microseconds after beginning of rapid crack propagation.

[1]用全息焦散线法和脉冲全息显微术测量了以550 m/s速度扩展的裂纹在启裂后18和73微秒时的裂尖应力场。获得了以下结果。(i)在沿裂纹沿着方向上，无论是在启裂后18微秒还是在启裂后73微秒，都没有出现高阶奥伯项的影响，并且在距裂纹尖端9mm处有奇异场的发展。因此，裂纹张开位移的测量总是给出动应力强度因子的真实值。(ii)在与裂纹扩展方向成72度的方向上，在裂纹开始后18微秒的时间出现高阶项的影响。但它在73微秒时消失，并且奇异场发展到距离尖端5 mm远。[2]用干涉法测量了裂纹尖端应力场，得到了与上述相同的结果。[3]因此可以说，如果在裂纹快速扩展开始后的几十微秒内进行测量，高阶项会影响焦散线法动态应力强度因子的测量。

项目成果

鈴木,中根: "高速進展開始直後のき裂に対するコウスティック法の適用について" 日本機械学会論文集(A編). 59. 2113-2119 (1993)

Suzuki, Nakane：“高速传播开始后立即应用苛性碱方法”《日本机械工程师学会会议录》（A 版）59. 2113-2119 (1993)。

SUZUKI,S.and NAKANE,K.: "Effect of Higher Order Terms on Measurement of Dynamic Stress Intensity Factor with Optical Methods" Proc.Conf.Advanced Technology in Experimental Mechanics. 143-148 (1993)

SUZUKI,S. 和 NAKANE,K.：“高阶项对用光学方法测量动态应力强度因子的影响”Proc.Conf.实验力学先进技术。

宮崎,野崎,鈴木: "高速進展開始直後におけるき裂先端応力場に現れる高次項成分の影響について(光干渉法による測定)" 日本機械学会第72期全国大会講演論文集. 1. 511-513 (1994)

宫崎、野崎、铃木：“关于高速传播开始后裂纹尖端应力场中出现的高次成分的影响（通过光学干涉测量）”第72届日本机械学会全国会议论文集工程师。1. 511-513 (1994)

Suzuki, S., Nakane, K., and Miyazaki, F.: "Measurement of Stress Field around Fast Propagating Crack Tips by Means of Interferometry." Proc. 7th Sympo. Fracture and Fracture Mechanics. 151-155 (1993)

Suzuki, S.、Nakane, K. 和 Miyazaki, F.：“通过干涉测量法测量快速传播裂纹尖端周围的应力场”。

鈴木,中根,宮崎: "光干渉法による高速進展き裂先端部の応力場計測" 第7回破壊力学シンポジウム講演論文集. 151-155 (1993)

Suzuki、Nakane、Miyazaki：“使用光学干涉测量快速生长裂纹尖端的应力场”第七届断裂力学研讨会论文集 151-155 (1993)。