MIL-STD 810, Method 516, Shock Testing Overview

This is part one of a series of blog posts concerning the MIL-STD 810 Shock Section, Method 516.  This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014.  DES has the experience and expertise to run your MIL-STD-810 test.  For more information, please check out our DES shock testing services page. 

MIL-STD-810 is a public military test standard that is designed to assist in the environmental engineering considerations for product design and testing.  For the purposes of this blog series we will focus on Method 516.7, Shock Testing.

The purpose of shock testing is to:

  1. Evaluate if a product can withstand shocks encountered in handling, transportation, and service environments
  2. Determine the product’s fragility level
  3. Test the strength of devices during a crash situation to verify that parts do not break apart, eject and become a safety hazard

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Extreme Combined Temperature & Vibration Testing

DES successfully completed a challenging combined temperature and vibration test which involved high G levels coupled with extreme temperatures!  The vibration conditions required for this test were 10 to 2000 Hz, 20G maximum sinusoidal acceleration.  These sinusoidal vibration tests were conducted during temperatures of -54°C and 200°C.

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A Primer for HAST: Highly Accelerated Stress Testing

HAST Chamber: Highly Accelerated Stress Testing

DES’s HAST Chamber

The HAST acronym stands for Highly Accelerated Temperature/Humidity Stress Test and is sometimes shortened to Highly Accelerated Stress Testing. HAST makes use of accelerated temperature and humidity conditions to precipitate failures which could be caused by long term exposure to humid environments.

HAST has been developed to replace Temperature-Humidity-Bias (THB) testing which has typical conditions of 85 ⁰C and 85 % RH along with a bias voltage applied to the sample. A typical THB test time would be 1000 hours. HAST uses increased test temperatures of 110 to 130 ⁰C which decreases the test time to as low as 96 hours compared to a THB test. Thus, by choosing HAST over THB for an accelerated reliability test, testing can be completed in days, not weeks.

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Accelerated Temperature Humidity Testing Using the Arrhenius-Peck Relationship

Humidity Testing can be used to accelerate the aging of products that are affected by ambient humidity levels. Increasing the humidity above the normal use level humidity can cause defects or failures to occur in shorter times than what would be observed in the field.  Humidity testing is most commonly performed along with testing at elevated temperature so that the resulting acceleration factor is affected by both humidity and temperature. The Acceleration Factor (AF) which is the ratio of the life at use conditions to the accelerated life at test conditions for temperature humidity testing is given by the following Arrhenius-Peck equation:

Acceleration Factor

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Delserro Engineering Solutions Featured in Digital Engineering

Digital EngineeringSimulation during the design phase allows engineers and designers to improve on their concepts and avoid mistakes.

New technologies have made this increasingly easier, a trend Digital Engineering looks at in their new article, “The SMB Case for Simulation” by Brian Albright.

Delserro Engineering Solutions was pleased to take part in this piece, which appeared in May.

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MIL-STD-810: Vibration Testing Category 24 – Minimum Integrity Tests (MIT)

This is part nine article in a series of product reliability testing blog posts concerning the MIL-STD 810 Vibration Section. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to help you determine what profiles are appropriate for your product and to run your MIL-STD-810 vibration test. For more information, please check out our Vibration Testing Services page and our other MIL-STD-810 vibration testing blog articles.

Vibration Testing Articles

MIL-STD-810 Vibration Testing Overview

MIL-STD-810: Vibration Testing Category 4 – Truck/Trailer – Secured Cargo

MIL-STD-810: Vibration Testing Category 9 – Aircraft – Helicopter

MIL-STD-810: Vibration Testing Category 7 – Aircraft – Jet

MIL-STD-810: Vibration Testing Category 8 – Aircraft – Propeller

MIL-STD-810: Vibration Testing Category 12 – Fixed Wing Jet Aircraft

MIL-STD-810: Vibration Testing Category 15 – Aircraft Stores

MIL-STD-810: Vibration Testing Category 20 – Ground Vehicles – Ground Mobile

Continue Reading MIL-STD-810: Vibration Testing Category 24 – Minimum Integrity Tests (MIT)

MIL-STD-810: Vibration Testing Category 20 – Ground Vehicles – Ground Mobile

This is part eight of a series of blog posts concerning the MIL-STD 810 Vibration Section. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to help you determine what profiles are appropriate for your product and to run your MIL-STD-810 vibration test. For more information, please check out our Vibration Testing services page and our other MIL-STD-810 vibration testing blog articles:

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MIL-STD-810: Vibration Testing Category 15 – Aircraft Stores

This is part seven of a series of blog posts concerning the MIL-STD 810 Vibration Section. This blog was written with reference to MIL-STD-810G w/Change 1 dated 15 April 2014. DES has the experience and expertise to help you determine what profiles are appropriate for your product and to run your MIL-STD-810 vibration test. For more information, please check out our Vibration Testing services page and our other MIL-STD-810 vibration testing blog articles:

Continue Reading MIL-STD-810: Vibration Testing Category 15 – Aircraft Stores