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:

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

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:

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

This is part five 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 8 – Aircraft – Propeller

This is part four 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 7 – Aircraft – Jet

This is part three 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 7 – Aircraft – Jet