IEST RP-PR003 1-2012 HALT and HASS.pdf
《IEST RP-PR003 1-2012 HALT and HASS.pdf》由会员分享,可在线阅读,更多相关《IEST RP-PR003 1-2012 HALT and HASS.pdf(23页珍藏版)》请在麦多课文档分享上搜索。
1、Institute of Environmental Sciences and Technology IEST-RP-PR003.1 Product Reliability Division Recommended Practice 003.1 HALT and HASS Arlington Place One 2340 S. Arlington Heights Road Arlington Heights, IL 60005-4516 Phone: (847) 981-0100 Fax: (847) 981-4130 E-mail: informationiest.org Web: www.
2、iest.org 2 IEST 2012 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-PR003.1 This Recommended Practice is published by the Institute of Environmental Sciences and Technology to advance the technical and engineering sciences. Use of this document is entirely voluntary,
3、and determination of its applicability and suitability for any particular use is solely the responsibility of the user. Use of this Recommended Practice does not imply any warranty or endorsement by IEST. This Recommended Practice was prepared by and is under the jurisdiction of Working Group 003 of
4、 the IEST Prod-uct Reliability Division. Copyright 2012 by the Institute of Environmental Sciences and Technology First printing, September 2012 ISBN 978-1-937280-07-9 PROPOSAL FOR IMPROVEMENT: The Working Groups of the Institute of Environmental Sciences and Tech-nology are continually working on i
5、mprovements to their Recommended Practices and Reference Documents. Sug-gestions from users of these documents are welcome. If you have a suggestion regarding this document, please use the online Proposal for Improvement form found on the IEST website at www.iest.org. Institute of Environmental Scie
6、nces and Technology Arlington Place One 2340 S. Arlington Heights Road Arlington Heights, IL 60005-4516 Phone: (847) 981-0100 Fax: (847) 981-4130 E-mail: informationiest.org Web: www.iest.org IEST-RP-PR003.1 Institute of Environmental Sciences and Technology IEST 2012 All rights reserved 3 HALT and
7、HASS IEST-RP-PR003.1 CONTENTS SECTION 1 SCOPE 4 2 REFERENCES . 4 3 TERMS AND DEFINITIONS . 4 4 BACKGROUND AND PURPOSE 5 5 HALT . 5 6 HASS 14 7 DIFFERENCES BETWEEN HALT AND HASS . 15 8 EQUIPMENT USED FOR HALT AND HASS . 16 9 FIXTURING 17 10 OTHER CONSIDERATIONS . 19 11 SUBJECTS OF CONCERN . 21 12 ADD
8、ITIONAL RESOURCES . 22 13 ACKNOWLEDGEMENTS 22 FIGURE 1 EXAMPLE FOR DETERMINING HOW MANY SAMPLES TO TEST. 7 2 THERMAL STEP STRESS TESTING. . 8 3 COLD STEP STRESS TEST EXAMPLE 8 4 HOT STEP STRESS TEST EXAMPLE. . 9 5 RAPID THERMAL CYCLING TESTING. . 9 6 REPETITIVE SHOCK TABLE TEST SETUP EXAMPLE. . 10 7
9、 ELECTRODYNAMIC SHAKER TEST SETUP EXAMPLE. 10 8 APPLICABILITY OF SHAKER TYPE 10 9 VIBRATION STEP STRESS TESTING. 11 10 LEGACY ESS INPUT. 11 11 SKEWED-AXIS TEST FIXTURE. 12 12 COMBINED VIBRATION AND THERMAL STEP STRESS TESTING. 12 13 EXAMPLE FIXTURING FOR REPETITIVE SHOCK. . 17 14 EXAMPLE OF FIXTURIN
10、G FOR ELECTRODYNAMIC SHAKER. 18 15 EXAMPLE PRODUCT THERMAL RANGES. 19 TABLE 1 LEGACY ESS INPUT . 12 2 EXAMPLE OF HASS THERMAL LEVELS 14 3 DIFFERENCES BETWEEN HALT AND HASS . 15 4 IEST 2012 All rights reserved Institute of Environmental Sciences and Technology IEST-RP-PR003.1 Institute of Environment
11、al Sciences and Technology Product Reliability Division Recommended Practice 003.1 HALT and HASS IEST-RP-PR003.1 1 SCOPE 1.1 Scope This Recommended Practice (RP) defines and de-scribes HALT (Highly Accelerated Life Testing) and HASS (Highly Accelerated Stress Screening). This RP contains information
12、 on the philosophy behind the testing, generic examples of tests, the differences between standard testing equipment and equipment used for highly accelerated testing, fixturing consid-erations, alternative approaches, additional environ-ments, and lessons learned, along with other useful informatio
13、n. This style of testing takes a Qualitative approach (looking for the quality of the design and workmanship) rather than a Quantitative approach (being able to use the results to calculate length of life in service). This RP is not meant to take the place of a test specification but to be used in c
14、onjunction with a test specification or as general guidance. 2 REFERENCES The cited editions of the following documents are incorporated into this RP to the extent specified here-in. Users are encouraged to investigate the possibility of applying the most recent editions of the references. MIL-STD-8
15、10: Test Method Standard for Environ-mental Engineering Considerations and Laboratory Tests Military Standards Standardization Document Order Desk 700 Robbins Avenue Bldg #4, Section D Philadelphia, PA 19111, USA http:/dodssp.daps.dla.mil/ 3 TERMS AND DEFINITIONS acceleration The rate of change of v
16、elocity with respect to time. For vibration testing, acceleration is usually ex-pressed in gravitational units (g) but may also be ex-pressed as m/sec2. accelerometer A sensor for converting acceleration into an electrical signal; a transducer featuring instantaneous output proportional to the insta
17、ntaneous acceleration input. bathtub curve A plot of product failures versus time, which has three sections: The first shows decreasing “infant mortality” (early failures); the second, constant random failures; and the third, increasing wear-out failures. dwell The length of time during which a test
18、 article is sub-jected to an environment (e.g., thermal or vibration). electrodynamic (ED) shaker A type of shaker that uses electrical energy to create dynamic motion. In physics, the technology used is referred to as the “voice coil principle.” environmental stress screening (ESS) The application
19、of forcing function to a product for the purpose of characterizing the environmental per-formance of the product. Failure Modes and Effects Analysis (FMEA) A methodology conducted during product develop-ment to identify and classify potential reliability problems, and to define a course of action to
20、 mitigate failures according to priority. fixture An intermediate structure used to attach a test unit to a test platform such as a vibration table. IEST-RP-PR003.1 Institute of Environmental Sciences and Technology IEST 2012 All rights reserved 5 Fourier transform; discrete Fourier transform (DFT)
21、The representation of a time-history by a harmonical-ly related series of sines and cosines. The digitally sampled time-history is represented by the DFT. g-level The acceleration time-history amplitude of a pyroshock as measured by an accelerometer calibrat-ed in gs. May also be expressed in m/sec2
22、. gRMSThe root-mean-square acceleration. Power Spectral Density (PSD) The limiting mean-square value per unit bandwidth (i.e., the limit of the mean-square value in a given rectangular bandwidth divided by the bandwidth). These bands are grouped into a plot of power level (in g2/Hz) vs. frequency (i
23、n Hz), over the frequency range of interest. The resulting plot gives an indica-tion of the power at each frequency. root-mean-square (RMS) The square root of the time-averaged squares of a series of measurements. transducer (sensor) A device that converts shock or vibration into an electrical signa
24、l that is proportional to the parameter of the experienced motion or force. NOTE: The term “transducer” is often used inter-changeably with the term “sensor” in industry. The term “sensing element” is used to describe the sens-ing mechanism inside the transducer or sensor. 4 BACKGROUND AND PURPOSE H
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- IESTRPPR00312012HALTANDHASSPDF