GB/T 41941-2022 English PDF

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GB/T 41941-2022: Rubber, vulcanized - Measurement of fatigue crack growth rate
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Basic data

Standard ID: GB/T 41941-2022 (GB/T41941-2022)
Description (Translated English): Rubber, vulcanized - Measurement of fatigue crack growth rate
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G40
Classification of International Standard: 83.060
Word Count Estimation: 14,191
Date of Issue: 2022-12-30
Date of Implementation: 2023-04-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41941-2022: Rubber, vulcanized - Measurement of fatigue crack growth rate

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 83.060 CCSG40 National Standards of People's Republic of China Determination of fatigue crack growth rate of vulcanized rubber (ISO 27727.2008, MOD) Posted on 2022-12-30 2023-04-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is modified to adopt ISO 27727.2008 "Determination of Vulcanized Rubber Fatigue Crack Growth Rate". The technical differences between this document and ISO 27727.2008 and their reasons are as follows. --- Increase the scope of application of this document (see Chapter 1) to meet the standardization requirements of our country; --- Replaced ISO 23529 (see 5.3, 5.4, 6.3, 6.4 and 7.1) with my country's standardization document GB/T 2941 to adapt to my country's standard standardization requirements; --- Added a sample type (see Type B in 6.1) to match the various clamping methods of the current test equipment. The following editorial changes have been made to this document. --- Added note "If necessary, mark the rolling direction on the sample." (see 6.5). Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Petroleum and Chemical Industry Federation. This document is sponsored by the General Test Method Subcommittee of National Rubber and Rubber Products Standardization Technical Committee (SAC/TC35/SC2) Focus on. This document is drafted by. Shanghai Fasen Testing Technology Co., Ltd., Shandong Linglong Tire Co., Ltd., Guizhou Tire Co., Ltd. Division, Triangle Tire Co., Ltd., Hangzhou Chaoyang Rubber Co., Ltd., Double Star Group Co., Ltd., Sailun Group Co., Ltd., Shuangqian Group Shanghai Tire Research Institute Co., Ltd., Anhui Jiatong Passenger Radial Tire Co., Ltd., Beijing Institute of Science and Technology Analysis and Measurement Experimental Research Institute (Beijing Physical and Chemical Analysis and Testing Center), Yiruibo Technology (Tianjin) Co., Ltd., Beijing University of Chemical Technology, Otsuka Material Technology (Shanghai) Co., Ltd., High-speed Railway Testing Instrument (Dongguan) Co., Ltd., Taizhou Gangyang Rubber and Plastic Co., Ltd., Guangzhou Kewei Instrument Co., Ltd., Beijing Rubber Industry Research and Design Institute Co., Ltd. The main drafters of this document. Gong Jianming, Zhang Zhiyuan, Zhang Lijie, Liu Jianyue, Su Juqiao, Li Jie, Xu Yi, Yan Wenli, Dai Zhongjuan, Jin Zhenhuan, Guo Fei, Huang Quanze, Zhang Wei, Dong Wenwu, Zhang Lingyan, Liu Zhijiang, Wu Xianhe, Guo Xia, Gao Xia, Wang Hao, Mu Longhai, Li Fanzhu, Wen Shipeng, He Jionghao, Li Yanlei, Men Xincheng, Chen Yunzhong, Kan Zhiqian, Xu Jinhai, Xie Gengxin, Li Shaojie, Xie Junfang, Sun Siwen. Determination of fatigue crack growth rate of vulcanized rubber

1 Scope

This document describes a method for determining the crack growth rate of vulcanized rubber under long-term cyclic fatigue. Crack from the tip of the pre-notched specimen end and gradually expand until the final crack is large enough for complete failure. Using pure shear specimens, by monitoring cracks during cyclic loading To obtain the crack growth rate, that is, the increase in crack length per cycle. Adjust the loading by changing the strain amplitude of the sample The strain energy density loaded on the sample can achieve the purpose of measuring the crack growth rate under different tear energy conditions. This document applies to the determination of fatigue crack growth rate of vulcanized rubber.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 2941 General procedure for specimen preparation and adjustment of rubber physical test methods (GB/T 2941-2006, ISO 23529.2004, IDT)

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 strain energy density When the sample is in a strained state, it originates from the work done when the sample deforms, and is the elastic energy stored in the unit volume of the sample. Note. The unit is Joule per cubic meter (J/m3). 3.2 tearing energy The energy required for a crack/crack to propagate in a specimen. Note. The tearing energy is expressed as the ratio of the total work done to the surface area of the crack, and the unit is joules per square meter (J/m2). 3.3 strain range parameter strain-rangeparameter PR (The sample is always in a strained state during the test) The minimum distance between the sample and the relaxed (zero strain) position in each cycle is the same as Ratio of the maximum distance from the slack position. Note. The strain range parameter PR=dmin/dmax, where dmin is the minimum distance from the relaxed position, and dmax is the maximum distance from the relaxed position.

4 principles

The crack length increases with the number of deformation cycles of the pure shear specimens with pre-notch under cyclic loading. ......

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