This is another part 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 and our other MIL-STD-810 shock testing blog articles:
DES recently completed RTCA DO-160Gvibration and shock testing for DB Integrations in Allentown PA, a manufacturer of aircraft components. The testing was performed on ARINC 600 Mounting Trays. The trays were vibration tested for use on fixed wing aircraft (Section 8, Category S) and for use on helicopters (Section 8, Category U2). Shock testing was also performed per Section 7, Category A in RTCA DO-160G. The trays withstood the rigorous testing that took 3 days to complete.
DES has extensive experience performing testing to standards such as RTCA DO-160G. For more information contact DES or call 610.253.6637.
This is part two 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 and our other MIL-STD-810 shock testing blog articles:
Shock testing according to Procedure I of MIL-STD 810, Method 516 is intended to test products while they are operating to see if any functional problems occur and to determine if they survive without damage. The applied shocks usually represent those that may be encountered during operational service. This article will focus on the shock test condition when measured field data is not available and the testing will use classical shock impulses. The terminal peak sawtooth is the default classical shock pulse to be used for this condition. Figure 516.7-10 from MIL-STD-810 shows its shape and tolerance limits. Table 516.7-IV contains the terminal peak sawtooth default test parameters for Procedure I -Functional Test. In limited cases a half sine shock impulse is specified. Its shape and tolerance limits are shown in Figure 516.7-12.
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:
Evaluate if a product can withstand shocks encountered in handling, transportation, and service environments
Determine the product’s fragility level
Test the strength of devices during a crash situation to verify that parts do not break apart, eject and become a safety hazard
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.
Continue reading Extreme Combined Temperature & Vibration Testing →
This is part two 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 Part 1 – MIL-STD-810 Vibration Testing Overview blog and our Vibration Testing services page.
Category 4 of Method 514.7 Vibration testing details the transportation random vibration environmental conditions from cargo interaction with vehicle suspension and structures with road and surface discontinuities. “This environment may be divided into two phases, truck transportation over US highways, and mission/field transportation. Mission/field transportation is further broken down into two-wheeled trailer and wheeled vehicles categories.”
Truck Transportation over US Highways Vibration Testing
This vibration test method is used when products or equipment will be transported by large trucks tractor-trailers commonly seen on US highways. The truck transportation over US highways random vibration profile is designed to simulate 1609 km (1000 miles) on interstate highways. The random vibration profile along each axis can be seen in the plot below in Figure 1. The length of this profile is 60 minutes per axis for each 1000 miles of transportation. For example to simulate 2000 highway miles, the vibration test duration would be 2 hours per axis x 3 axes = 6 hours total.
Figure 1. Figure 514.7C-2 from MIL-STD-810G w/ Change 1
This is part one of a series of blog posts discussing MIL-STD 810 Vibration Testing. 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. Check out our vibration testing capabilities here.
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 514.7, titled Vibration. This section defines the environmental vibration conditions a material or product may experience during the product life cycle and translates these conditions into replicable test procedures. Unfortunately, unless you’re familiar with this document, this section or any section for that matter may seem a little daunting. This blog will hopefully provide some guidance into navigating your way through it.
Figure 1. Table 514.7-I from MIL-STD-810G w/ Change 1
DES recently performed qualification testing on aerospace connectors which involved combined temperature and sinusoidal vibration testing, random vibration testing and shock testing. Combined temperature and sinusoidal vibration tests were performed per EIA 364-28F. EIA 364-28F required test conditions of 10-2000 Hz, 20G maximum acceleration sweeps at temperatures of -54°C and 200°C over the course of 4 hours per axis. Random vibration tests were also performed per EIA 364-28F. Random vibrations at 50-2000 Hz, 46.3 Grms were applied to the connectors for 8 hours per axis. The random vibrations were applied at room temperature. Finally, the connectors were subjected half sine shocks per EIA 364-27C. The shock requirements were three shocks per polarity, per axis at 300G over the duration of 3msec. A sample shock plot can be seen in Figure 1.
Figure 1 – Sample Shock Test Plot
Continue reading Qualification Testing on Aerospace Connectors →
Nowadays global markets and expedited shipping methods expose packages to less than ideal conditions during the transport process. International Safe Transit Association (ISTA), International Air Transport Association (IATA), International Organization for Standardization (ISO) and American Society for Testing and Materials (ASTM) all contain protocols and requirements used to evaluate product package design. Some of these test profiles require combined environments such as combined temperature and vibration testing. This type of testing requires specialized equipment, set up and experience from the lab conducting the test.
Continue reading Package Testing Using Combined Temperature & Vibration →
