ASTM F355 PDF

For a comprehensive overview, read on Concussions are an insidious form of injury. The effects of individual concussions are most often fairly mild. Additionally, if a player has already experienced one concussion, they are more likely to experience another; and subsequent concussions carry a much higher risk of serious injury - up to, and including, death. Impact testing commonly referred to as g-max testing measures the shock-attenuation performance of sports surfaces - including synthetic artificial turf and natural turf athletic fields. Test results g-max values are a ratio: the ratio of the maximum acceleration deceleration experienced during an impact, to the normal rate of acceleration due to gravity.

Author:Faulmaran Jular
Country:Kazakhstan
Language:English (Spanish)
Genre:Business
Published (Last):15 September 2016
Pages:207
PDF File Size:19.85 Mb
ePub File Size:8.71 Mb
ISBN:657-4-58985-260-1
Downloads:92662
Price:Free* [*Free Regsitration Required]
Uploader:Yozshukus



For a comprehensive overview, read on Concussions are an insidious form of injury. The effects of individual concussions are most often fairly mild. Additionally, if a player has already experienced one concussion, they are more likely to experience another; and subsequent concussions carry a much higher risk of serious injury - up to, and including, death. Impact testing commonly referred to as g-max testing measures the shock-attenuation performance of sports surfaces - including synthetic artificial turf and natural turf athletic fields.

Test results g-max values are a ratio: the ratio of the maximum acceleration deceleration experienced during an impact, to the normal rate of acceleration due to gravity. The higher the g-max value, the poorer the shock-attenuation performance of the surface.

Measuring impact-attenuation is a fundamental tool of athletic field safety testing. It is also useful in assessing the playability of a field. Testing g-max values involves measuring the shock-attenuation performance of a playing surface in situ, and comparing the results against a standard.

How often should you test? It is important to note that g-max measurements are not static. On synthetic turf surfaces, g-max values will generally increase as the field ages.

On a natural turf field these same factors are at work, along with the moisture content of the soil, the type of turfgrass, and the density of coverage. This suggests that regular g-max testing is important - but how often is often enough?

Everyone agrees that new synthetic fields should be tested before they are accepted from the builder. If you make the commitment to have your synthetic field s tested, you should also commit to having the tests done properly: You should insist on using the services of an independent test provider. While many manufacturers will offer to do the testing, there is an inherent conflict of interest if they do it themselves. Your test provider should be knowledgeable of, and in compliance with, applicable ASTM standards.

Your provider should be able to show you copies of current standards and discuss them with you. The accelerometer used in the test equipment should have a current calibration certificate, and the calibration should be NIST traceable. Both a Clegg tester and a "F" tester can be used to calculate g-max values, but the numbers are not comparable.

Be wary of anyone who tells you they are! But what does this mean to you? As the owner or manager of a field, you have an obligation to provide safe facilities. As an athletic director or coach, you have a duty of care to the athletes under your supervision.

Your duty of care encompasses the obligation to make sure the facilities you use are inherently safe and properly maintained. As an architect or engineer, you should insure that g-max standards for safety and playability are clearly defined in the specifications you write.

You should require that all tests of synthetic surfaces be conducted by an independent test provider, in accordance with ASTM standards FA and F Click here to view a sample specification in pdf format.

DATING BLACK BOOK CARLOS XUMA PDF

ASTM F355 PDF

Bragor The GMax of a field is determined by dropping the missile 3 times in the same location and averaging the second two drops. All are considered concussions. The turf playing system typically includes field areas within and outside the inbound lines extending to the sport specific limit lines as defined by the appropriate regulating body or appropriate standard, or both. This abstract is a brief summary of the referenced standard. According to the Penn State Center for Turfgrass Science, impact attenuation of a playing surface is measured by an accelerometer mounted inside the missiles, that indicates surface hardness and is reported as Gmax. Reduce risk of injuries by putting performance safety layers under the field. HIC is the internationally recognized test standard for head injuries.

GRUTAS JUXTLAHUACA GUERRERO PDF

ASTM F1936-10 (2015)

Shale GMax Test — Brock International According to the Penn State Center for Turfgrass Science, impact attenuation of a playing surface is measured by an accelerometer mounted inside the missiles, that indicates surface hardness and is reported as Gmax. This is our playground product. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. A moderate head injury consists of a loss of consciousness, where a major head injury results in a skull fracture!

DOHAR PETER KIS ANGOL NYELVTAN PDF

Sports Surface Testing Machine

.

BEHRINGER XM8500 PDF

.

Related Articles