Defense Standard 00-035 Part 3: Mechanical Environmental Testing
The Defense Standard (DEF STAN) 00-035 part 3 evaluates equipment subjected to environmental mechanical, climatic, and chemical conditions. As an ISO-17025 accredited compliance test lab, we realize the importance of environmental mechanical testing. Meeting the environmental DEF STAN 00-035 Part 3 requirements can be difficult. We understand the challenges and guide companies through the process.
Keystone Compliance creates an accurate test plan to eliminate expensive over-testing. Our engineers take a consultative approach throughout the entire test program. Next, we expedite comprehensive reports shortly after completion of the test. Lastly, Keystone proudly has a reputation for helping customers achieve their environmental product certifications all under one roof.
Summary of DEF STAN 00-035 Part 3
DEF STAN 00-035 Part 3 evaluates the ability of a material to withstand the effects of specific environments. However, the defensive standard 00-035 part 3 does not necessarily duplicate the actual environmental conditions.
DEF STAN 00-035 is generally applicable to packages, materials, and subcomponents.
Within this standard, the test methods are grouped into sections relating to commonly encountered environments. These groups consist of mechanical, climatic, and chemical.
This page covers the mechanical environmental testing portion of the defensive standard 00-035 part 3. Please follow the links below for more information on climatic or chemical environmental testing.
DEF STAN 00-035 Part 3 General Test Procedures
For most test procedures in DEF STAN 00-035 standard, the test specimen must be pre-conditioned. All conditioned specimens must begin the test in the condition when in the natural environment.
When no other conditions are specified, but where the environment needs to be controlled, the conditions below are used.
Temperature: 20 C
Air Pressure: 101.3 kPa
Relative Humidity: 65%
When test conditions are specified, the test facility conditions must fall within the following ranges below. Variations in temperature and humidity are kept to a minimum. The temperature range for large specimens extends beyond the specified limits below.
Temperature: 15 C to 35 C
Air Pressure: 86 kPa to 106 kPa
Relative Humidity: 25% to 75%
DEF STAN 00-035 Part 3 Mechanical Testing
M1 – General Purpose Vibration. This defense standard 00-035 part 3 compliance test determines the effects of vibration environments. The test is applicable where material is required to show resistance to specific vibration conditions. The material can not show signs of functional or structural failure.
Unless otherwise specified, the procedure is carried out as followed:
First, the specimen is mechanically connected to specified multi-exciters and fixtures.
Next, any thermal and vibration instrumentation needed for the test is installed. The temperature chamber is adjusted to provide pre-conditioning requirements.
The vibration conditions are adjusted to meet specified levels. Functional or performance testing is performed at intervals during the test. The test procedure is repeated along each axis.
Lastly, the unit under testing is examined for detrimental effects.
M3 – General Purpose Shock. The purpose of general shock testing is to determine the effects of shock on a material. This test is required to demonstrate the integrity of a material to resist the specified shock conditions without unacceptable degradation. A decline in either functional or structural performance classifies as unacceptable degradation.
For general shock testing, the specimen is mechanically connected to the shock table or fixture. Next, pre-test performance evaluations are carried out.
Following the pre-tests, functional tests are performed in specified intervals during the testing. The test procedure is repeated by applying specific shock waveforms along each specified axis.
After testing, the specimen is examined for adverse effects.
M4 – Drop, Topple, and Roll. This test evaluates the ability of a material to survive exposure to dropping, toppling, and rolling environments. These conditions are likely to occur during a unit’s operational life. More specifically, these may occur during handling and servicing.
The M4 test contains five separate procedures: drop onto a face, drop onto a corner, topple onto a flat surface, topple onto an obstacle, and roll. Together, these are intended to ensure a degree of robustness of materials and packaging during handling.
Before testing, the specimen is configured with all covers, cables, etc. as specified in the standard. Any functional or performance checks are carried out before and after testing.
Drop Test onto a Face Test: Standing on its normal base, the specimen is tilted on one of its bottom edges. If the angle of the tilt is not specified, then the angle made by the bottom of the unit and test surface is 30 degrees.
The specimen is allowed to fall freely onto the test surface. The unit under testing is subjected to a specified number of drops from each of the edges.
Drop Test onto a Corner Test: Standing on its normal base, the specimen is raised above the test surface. A spacer 10 mm high is placed under one corner. A 2 mm spacer is adjusted under the adjacent corner.
The specimen is lifted and allowed to fall freely onto the test surface. If the specimen can topple further onto the next face, it is not prevented from doing so.
Topple Test onto a Flat Surface Test: The specimen is tilted about on one bottom edge. This is done until it reaches a position of instability. Once this occurs, the specimen is allowed to fall over freely from this position onto an adjacent face.
The unit under testing is subjected to a specific number of topples for each of the edges.
Topple Test onto a Steel Girder Test: First, a girder is positioned so that the impact can occur on an edge of the girder. The impact must also be parallel to the pivot edge of the specimen.
Standing on its normal base, the specimen is tilted about the pivot edge. This is carried out until the specimen reaches a position of instability. Once this occurs, the specimen is allowed to topple so that it impacts the girder.
Roll Test: The specimen is placed standing on a specific face. Next, the unit is tilted about on one bottom edge. This is done until the specimen reaches a position of instability.
The specimen is then allowed to fall over freely from this position. Additionally, it is allowed to roll for a specified distance.
This is carried out for a specific number of topples for each edge.
M6 – Operational Shock Simulation. The operational shock test is applicable to evaluate material transient responses. This DEF STAN 00-035 test procedure uses a shock response spectrum approach.
The operational shock procedure of this chapter is now encompassed within test procedure M3.
M11 – Bounce. The bounce test demonstrates the ability of a material to survive the effects of loose cargo transportation.
Equipment carried as loose cargo by land vehicles is commonly subjected to severe and repetitive shock. These shocks can arise from impacting, rebounding, and scuffing on the load-carrying platform. Shocks can also occur from impacts with the side walls of a vehicle.
This test applies to packages and packaged material. Bounce and loose cargo testing also apply to material transported on land vehicles, where it is carried loosely or attached to a payload bed with limited restraints. In some instances, restrained material may also be subjected to random shock conditions (bounce).
To conduct bounce and loose cargo testing, the specimen is first installed on a vibration platform without any fixtures or attachments. The unit under testing is subjected to specified vibrations. The test procedure is carried out for each of the required axes. After the completion of the bounce tests, post-test evaluations are carried out.
M12 – Bump. The defense standard 00-035 part 3 bump test is a repetitive simple half-sine shock pulse test. This defense standard 00-035 test is used to determine the ruggedness of components and minor sub-assemblies.
The bump test is now encompassed within M3 general purpose shock testing.
M13 – Steady State Acceleration. This test assesses the performance of material when exposed to a steady state inertial load. Inertial loads can be induced by platform acceleration, deceleration, and maneuver.
This test is generally performed on material installed or carried by land, sea, and air platforms. However, this test is also applicable to weapon systems.
This standard test method 00-035 contains two acceleration test procedures. One procedure uses a rotary centrifuge. The other test uses a trolley or sled. These two procedures are the most common to achieve a desired constant acceleration.
Expert Defense Standard 00-035 Part 3 Environmental Mechanical Testing
Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. In addition to environmental DEF STAN 00-035 Part 3 testing, Keystone has a full scope of expertise including EMC/EMI, shielding effectiveness, and package testing. Our team strives to give our customers more time and energy on product development instead of testing.
Contact us to see why so many companies work with Keystone each year to achieve their environmental standard test needs.
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