ISO 8318 Vibration Tests Using Variable Frequencies
ISO 8318 assesses the strength of items subjected to vertical vibrations. As an ISTA and ISO 17025 certified lab, we realize the importance of variable frequency vibration testing. Meeting the ISO 8318 requirements can be difficult. We understand the challenges and guide companies through the process.
Keystone Package Testing creates an accurate test plan to eliminate expensive over-testing. Our proven process helps avoid product launch delays. When packages do not meet the requirements, we assist with finding solutions. Keystone offers competitive pricing and volume discounts.
Summary of ISO 8318 Vertical Vibration Testing on Filled Transport Packages
The international standard specifies two methods. These methods are both used to carry out a sinusoidal vibration test on a complete, filled transport package or unit load. The testing procedures both use variable frequencies to accomplish these tests. ISO 8318 testing method also assesses the performance of a unit load in terms of the protection that it offers to its contents.
Each method may be performed as either a single or a part of a sequence of tests. The single test investigates the effects of vertical vibration. The sequence of tests measures the ability of a unit load to withstand a distribution system that includes a vibration hazard.
Scope of ISO 8318 Random Vibration Testing
Wherever possible, the test is carried out in atmospheric conditions identical to those used for conditioning. In other circumstances, the test is carried out in atmospheric conditions of those used for conditioning as closely as possible.
Method 1 – The test item is first placed in the predetermined attitude on the vibration table. If a superimposed load is required, the loading procedure will comply with ISO 2234. The packaged product is then subjected to a predetermined vertical sinusoidal vibration. These vibrations can vary up and down between 3 Hz and 100 Hz.
The acceleration is measured with an accelerometer which is attached to the table as close as possible to the test item. Lastly, horizontal frequency components may be present. Its acceleration is not recommended to exceed 20% of the value for the vertical component.
Method 2 – A resonance search test is performed over one or more complete sweep cycles applying a suitable lower level acceleration. This typically can range from 0,2 g to 0,5 g. The acceleration is then recorded and measured on the test item and on the table.
The most severe and critical resonances are determined. These may usually be up to three. Lastly, the endurance test is performed.
This is performed by sweeping over a frequency range varying between ± 10% of the defined resonance frequency. The procedure is repeated for other selected severe or critical resonances.
Significance of ISO 8318 Sine Vibration Testing
The ISO 8318 test specimen is placed on a vibration table and vibrated at a frequency which varies. The atmospheric conditions, the duration of the test, the peak acceleration, the attitude of the test item and its method of restraint are all predetermined.
Information included within the report introduces general and specific information. General information may encompass the date, time, location and test engineer. More specific information about the testing protocol and package performance may include, but is not limited to:
- A statement to the effect that the results related only to the test item.
- The number of replicate test items tested.
- A full description, including dimensions, structural and material specifications of the test item.
- A description of contents, if simulated or substituted contents were used.
- The duration of the tests.
- The method of restraint.
- The type of apparatus used.
- Any deviations from the test method described in this international standard.
Expert ISO 8318 Sine Wave Vibration Testing
Keystone can accommodate flexible and rigid packages of all sizes, including large pallets. Our team strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling.
Contact us to learn first hand why so many companies partner with Keystone to achieve their supply chain certification needs.