GB/T 20736-2006 PDF English
US$485.00 · In stock · Download in 9 secondsGB/T 20736-2006: Fatigue test method for transmission precision roller chain Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 20736-2006 | English | 485 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Fatigue test method for transmission precision roller chain
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 20736-2006
GB/T 20736-2006: Fatigue test method for transmission precision roller chain---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20736-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.220.30
J 18
GB/T 20736-2006 / ISO 15654.2004
Fatigue test method for transmission precision roller chain
(ISO 15654.2004, IDT)
Issued on. DECEMBER 25, 2006
Implemented on. MAY 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Test principle... 5
5 Test apparatus... 6
6 Test specimens... 7
7 Test procedure... 7
8 Staircase test data analysis... 10
9 Report of test results... 12
Annex A (informative) Survival test with abridged Probit analysis... 14
Annex B (informative) Combined test method (CTM)... 18
Annex C (informative) Justification for adding one step to fatigue limit in staircase
analysis... 25
Annex D (informative) Adding an additional “phantom” point at the end of staircase
test... 28
Annex E (informative) Reporting fatigue test results... 29
Annex F (informative) Establishing chain application fatigue ratings... 35
Annex G (informative) Extrapolating fatigue strength from 3×106 cycles to 107 cycles
... 42
Annex H (informative) Finite life testing and data analysis... 48
Bibliography... 55
Foreword
This Standard is identical to the international standard ISO 15654.2004, Fatigue test
method for transmission precision roller chains (English version).
Annex A ~ Annex H of this Standard are informative annexes.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee 164 on
Chain Drives of Standardization Administration of China (SAC/TC 164).
Organization responsible for the drafting of this Standard. Jilin University (former Jilin
University of Technology).
Organizations participating in the drafting of this Standard. Hangzhou Donghua Chain
Group Co., Ltd., Jiangsu Shuangling Chain Transmission Co., Ltd., Hangzhou Xilin
Chain Manufacturing Co., Ltd., Zhejiang Hengjiu Machinery Group Co., Ltd., KMC
Chain (Shenzhen) Co., Ltd., Qingdao Zhenghe Industrial Co., Ltd.
Main drafters of this Standard. Meng Xiangbin, Ye Bin, Cao Sujian, Ma Jinhua, Shou
Feng, Chen Xinqiang, Jin Yumo.
Participating drafters of this Standard. Wang Hai’ou, Xu Meizhen, Tan Guangcheng,
Wang Zhijun, Meng Danhong, He Mingzong, Fu Zhenming, Wang Ying.
Fatigue test method for transmission precision roller chain
1 Scope
This Standard specifies an axial force fatigue test method for transmission roller chains,
the tests being of the fluctuating tension type, carried out at room temperature in air,
with the force applied along the longitudinal axis of the chain. It also specifies
procedures for statistically analyzing the test results and gives formats and elements for
presenting the results of fatigue tests and analyses.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, all subsequent amendments (not including errata
content) or revisions do not apply to this standard. However, parties to agreements that
are based on this Standard are encouraged to study whether the latest versions of these
documents can be used. For undated references, the latest edition applies to this
Standard.
GB/T 1243-2006, Short-pitch transmission precision roller and bush chains,
attachments and associated chain sprockets (ISO 606.2004, IDT)
3 Terms and definitions
Symbols, terms, definitions and units are given in Table 1 and Figure 1.
4 Test principle
Fatigue tests are made on transmission roller chains to determine fatigue properties of
chain plates such as those shown on Figure B.1 or to verify conformance to dynamic
strength requirements in GB/T 1243 and GB/T 14212.
5 Test apparatus
The test fixtures shall be capable of transmitting an axial force to the test piece without
inducing a subsidiary force caused by the fixtures. Universal type fixtures shall be used
for fatigue testing of transmission chains.
6 Test specimens
At least 5 free pitches of chain shall be used as a fatigue test specimen, except for
chain pitch over 50.8 mm where a minimum of 3 free pitches are acceptable. Free
pitches are those chain pitches that do not contact the fixtures.
7 Test procedure
For analyses of fatigue test data, maximum forces shall be corrected to zero minimum
force. A test force is obtained by correcting the maximum force to zero minimum force
by means of the Johnson–Goodman method [Equation (3)]. The Johnson–Goodman
relationship is illustrated by Figure 3.
A longitudinal tensile force shall be applied, sinusoidally varying between the minimum
test force determined according to 7.1.1 and the maximum test force determined
according to 7.1.2.The fatigue test shall continue to endurance or until the specimen
fails without reaching the endurance.
8 Staircase test data analysis
It is customary to tabulate and plot the data as a staircase test progresses to ensure that
the rules for constructing a staircase are followed. An example of such a data plot (three
levels and 95% confidence level) is shown in Table 3.
The standard deviations of the staircase data shall be calculated using Equation (7).
The fatigue limit of the staircase test shall be calculated using Equation (8).
9 Report of test results
The originator shall provide to the user the following.
The originator shall provide to the user the following.
Annex A
(informative)
Survival test with abridged Probit analysis
The purpose of the survival test with abridged Probit analysis is determine the mean
fatigue limit and its standard deviation. It may also be used to determine the step size
for future staircase testing of the subject chain model.
Annex B
(informative)
Combined test method (CTM)
The purpose of the combined test method (hereinafter referred to as CTM) is to
determine the slope of the F-N line and the fatigue limit of a particular chain in a single
test series. The CTM also may be used to determine the step size for future staircase
testing.
Annex C
(informative)
Justification for adding one step to fatigue limit in staircase analysis
The staircase analyses in this Standard utilize all test points, both failures and run-outs.
The calculated minimum fatigue strength (Fb-3S) is always less than the lowest test
force. By definition, all responses at the lowest test force must be run-outs.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 20736-2006 be delivered?Answer: The full copy PDF of English version of GB/T 20736-2006 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 20736-2006_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 20736-2006_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 20736-2006 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB/T 20736-2006?A step-by-step guide to download PDF of GB/T 20736-2006_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 20736-2006".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|