MIL STD 810 Shock Test Methods Are Numerous

MIL STD 810 Shock
MIL STD 810 Shock

MIL-STD-810 Shock Methods and Procedures

MIL-STD-810 contains numerous shock methods and procedures that provide laboratory simulations of real world events.  Mechanical shock can adversely effect the integrity of a component, especially if the resonances of the shock harmonize with natural frequencies of that component.

To ensure effective developmental test and evaluation of a product it is important to understand these types of shocks, their characteristics, and how they could potentially effect the product to be tested.  Methods for evaluation in MIL-STD-810 include:

  • Shock
  • Pyroshock
  • Gunfire Shock
  • Ballistic Shock
  • Rail Impact

Method 516.8 Shock

Method 516.8 Shock has eight different procedures these procedures include:

  • Functional Shock – Tests equipment its operational modes to evaluate its ability to perform as intended during and after exposure to mechanical shock.
  • Transportation Shock – Tests equipment to shocks expected during transportation.  Ground vehicle profiles are often used due to their severity.
  • Fragility – Procedure III (Fragility) is often performed early in the development cycle to establish a fragility level of a design so that shipping and packing designs can be adequately developed.
  • Transit Drop – Tests equipment’s ability to endure drops encountered during loading and unloading.
  • Crash Hazard Shock – This procedure verifies the integrity of mounts and fasteners to prevent equipment mounted in air or ground vehicles from creating hazards during shocks encountered during a crash event.  This often employs classical shock test waveforms.
  • Bench Handling Shock – Shocks commonly encountered during packaging and maintenance.
  • Pendulum Impact – This procedure is used to evaluate the effects of horizontal impacts on large shipping containers
  • Catapult Launch/Arrested Landing – This tests materiel mounted on aircraft that operate on aircraft carriers.

Method 517.3 Pyroshock

Pyroshock testing is performed to assess materiels ability to operate as intended and survive when operating near detonated explosive devices.  This method has five procedures that vary in accordance with closeness of the explosive shock and method of employing that shock.  The shock can be administered using actual explosions, mechanical test devices such as those used in shipboard shock test machines, electrodynamic shakers, or beam resonant shock machines.

Pyroshock presents particular challenges for designers in that it has has a shock response spectrum ranging from 100 Hz to 1 MHz.  These shocks can range from 300 to 200,000 gs.  Because of the high frequencies encountered, effects of pyroshock can include damage to small electronic components and cause relay chatter.  High frequencies can also generate piezoelectric effects that can cause unexpected operation of materiel

Method 519.8 Gunfire Shock

Gunfire shock testing is used to evaluate a components ability to withstand high rate repetitive shocks from gunfire.  This method is not intended to replicate effects of large single shot weapons such as large naval guns.  To adequately tailor a test plan it is important to know what specific weapon is being employed, what that rate of fire is, and where the material to be tested is with respect to the gun.  Measured data from the component location on the intended platform is preferred for replication in the laboratory setting.

Method 522.2 Ballistic Shock

Ballistic shock is the shock experienced when a projectile impacts an armored surface.  This testing is limited to equipment intended for use in armored combat vehicles.  As with pyroshock, ballistic shock has a very broadband of frequencies with high acceleration and poses special concerns for electronic devices. 

Testing can include with actual projectiles being fired at armor hulls and turrets (testing performed on a military base).  Usually testing is performed using various types of shock machines such as those used in MIL-S-901 Shipboard Shock.

Method 526.2 Rail Impact

Rail Impact testing is used to evaluate tie down methods for systems that will be transported on rail cars.  The impact of concern is that which occurs during the coupling process.  These tests are performed using a locomotive, a cushioned draft car with the test item secured.  These are conveyed at speeds of 4, 6, and 8 mph and collided into a draft car upweighted with brakes set.

Choosing Appropriate MIL-STD-810 Shock Methods

Because time and money are limited resources, decisions must be made as to which testing will be performed.  While requirements can offer a degree of clarity into relevant test methodology selection, a thorough assessment must be made through a Life Cycle Environmental Profile (LCEP) to develop an effective test matrix. 

The LCEP will map all anticipated logistical, tactical, and operational shock events and offer appropriate parameters for test selection and severity.  These inputs combined with requirements and measured data are then placed into an Environmental Issues/Criteria List (EICL).  Selection can then be made based on a risk assessment of vulnerabilities of the product based and probability of an environmental stress to occur.

Characteristics of Shock Types

Mechanical shock are generally events that have a short duration of under a second and are usually limited in frequency below 4 kHz.  Other types of shock such as Pyroshock (Pyrotechnic Shock) , Ballistic Shock, and Shipboard Shock (MIL-DTL-901) can have much higher frequency components. 

As we have seen, pyroshocks, typically are less than 20 milliseconds in duration with a frequency range of 100 Hz to 1 MHz.  Therefore consideration must be given to the test items vulnerabilities to shock frequency content as well as  g forces.

Making the Decisions

MIL-STD-810 provides guidance for selection of appropriate test methodologies.  This allows for the development of systems in a timely fashion without excessive testing and over engineering.  When selecting, for example, appropriate scenarios for Transport Drop for Tactical situations, look at those with the greatest impact velocity and then make a risk assessment as to which of these would pose the greatest threat to the test item based on the probability of an event to occur. 

CVG Strategy Can Help

Our team of test and evaluation experts can assist you in creating a meaningful test program that meets requirements and prevents costly failures at the operational test stage.  CVG Strategy provides an array of services to help you with environmental and EMI/EMC testing.  We also offer classes in MIL-STD-810 to help you keep current with the latest developments in this important standard.


ITAR Requirements – Export Compliance Program

ITAR requirements
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Essential Features of an ITAR Compliance Program

International Traffic in Arms Regulations (ITAR) compliance is a requirement for companies entering markets with defense related applications.  To establish an effective ITAR compliance program all segments of a business must be involved.  Important features of an ITAR program include the following:

  • Registration with the Directorate of Defense Trade Controls (DDTC)
  • Establishing an Export Compliance Officer
  • An effective and continuous training program for all employees
  • Effective Cybersecurity
  • Visitor Access Control
  • A continuing review and evaluation of the ITAR program

DDTC Registration

DDTC registration is a requirement for organizations involved with the manufacture, export, temporary import, brokering, provision of technical services, or involved with technical data of ITAR controlled items as defined on the United States Munitions List (USML) Part 121 of the ITAR.

Export Compliance Team

The primary positions for the development and maintenance of a compliance program are the Empowered Official and the Export Compliance Officer.

The Empowered Official is an individual directly employed by an organization who is legally empowered to authorize license applications.  The Empowered Official verifies the legality of transactions and has the right to refusal of any license application.

An Export Compliance Officer (ECO) is the appointed individual of an organization who has the prime responsibility and approval authority for the ITAR export compliance program.  As such the ECO duties include maintaining DDTC registration, submission of Technical Assistance Agreements (TAA), creation of Technology Control Plans (TCP), ensuring that information and facility security is maintained, filing of Temporary License Exemptions (TLA), record keeping, and submission of Voluntary Disclosures.

Export Compliance Training

Regular training is a requirement for all involved employees in an export compliance program. This is a requirement by both the Bureau of Industry and Security (BIS) and the Department of State Directorate of Defense Trade Controls (DDTC).

Cybersecurity Requirements

The security of classified and Controlled Unclassified Information (CUI) in the the Defense Industrial Base (DIB) has long been a source of concern for the Department of Defense (DoD).  In response the DoD has established the Cybersecurity Maturity Model Certification (CMMC) framework, a criteria for cybersecurity requirements and basic cyber hygiene can be established for DoD contractors.

CMMC requirements are largely based on NIST 800-171 Protecting Controlled Unclassified Information in Nonfederal Systems and Organizations. There are however, other requirements including FAR 52.204-21.

Facility Security

Maintenance of site security is essential for the protection of information.  This security includes control of facility access, posting of areas of limited access, and visitor badges.

Review and Evaluation of the Export Compliance Program

The export compliance program should be audited and reviewed at regular intervals.  This review should be conducted with the participation of upper management.

The Risks of ITAR Violations

Companies attempting to find a quick fix will often overlook the complexities involved in meeting ITAR requirements and place themselves in legal jeopardy.  Because of this they place themselves at risk of failing to comply with ITAR and facing severe penalties.  These penalties can include civil fines as high as $500,000 per violation or criminal fines of up to $1,000,000 and 10-years imprisonment per violation.  They can also include being barred from future exports and a loss of reputation of a business.

Meeting ITAR Requirements Effectively

Meeting ITAR requirements effectively should include by in from the top down.  It must involve all employees.  It must ensure security of a company’s facilities and maintain control of sensitive data.

A properly established program can continually protect a business by integrating with Quality Management Systems (QMS) to evaluate itself.  This allows for a means to detect risks in ITAR Compliance and adjust procedures accordingly.

CVG Strategy

If you are part of a large corporation or a small company with a part-time compliance person, CVG Strategy has the compliance and training programs to help you meet ITAR requirements.  Often smaller businesses often don’t have the bandwidth to dedicate to adequate export compliance.  Because of this we offer outsourced Export Compliance Officer services.  We also offer signs and accessories to aid in Visitor Access Control on our ITAR Store.

CVG Strategy, LLC is recognized the world over as the premier provider of customized ITAR Consulting and ITAR & Export Compliance Programs and Training that addresses critical U.S. Government regulations, from Export Administration Regulations (EAR), to the International Traffic in Arms Regulations (ITAR) and Office of Foreign Asset Controls (OFAC) and other regulatory agencies and more.