ASTM D1746 PDF

ASTM D1746 PDF

ASTM D Standard Test Method for Transparency of Plastic Sheeting. Clarity – ASTM D This test method covers the measurement of the transparency of plastic sheeting. While this test may be used for any transparent material. Find the most up-to-date version of ASTM D at Engineering

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Historical Version s – view previous versions of standard. The object is viewed from the opposite side of the light source The polarized light indicates the number of fringes or rings, which is related to the amount of stress, if light is used. You may delete a document from your Alert Profile at any time.

A relatively flat, colored specimen is placed in a specimen holder. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability atsm regulatory limitations prior to use. D17466 correlation is poor for highly diffusing materials because of interference of scattered d17466 in the visual test. Although generally applicable to any translucent or transparent material, it is principally intended for use with nominally clear and colorless thin sheeting.

The reading is recorded as percentage clarity directly from the measurement unit. The specimen is placed in the specimen holder. Photoelasticity Photo-elasticity is a visual asgm for measuring stresses. Specimen must be free from dust and dirt.

The L, a, b values are noted down.

Standards Subsctiption may be the perfect solution. My presentations Profile Feedback Log out. Stress optical sensitivity is define as the ability of some materials to exhibit double refraction of light when placed d17446 stress.

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Surface test areas shall be free from abrasion and warpage. Already Subscribed to this document. Knowledge of these optical properties is needed for several reasons: Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards.

Subscription pricing is determined by: If a calibrated standard is to be used, it is inserted in the specimen holder, and the instrument brought to balance upon the value assigned to the standard. Several additional techniques are asfm in conjunction with d7146 basic photoelastic concept, which make it possible to analyze complex or unusual problems.

OPTICAL PROPERTIES.

Its measured by quantity of light deviates by more than 2. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Please first log in with a verified email before subscribing to alerts. About project Atm Terms of Service. If the document is revised or amended, you will be notified by email. This standard is not included in any packages. When a photo elastic material is strained and viewed under polarized light. Results obtained by the use of this test method are greatly influenced by the design parameters of the instruments; for example, the resolution is largely determined by the angular width of the receptor aperture.

To make this website work, we log user data and share it with processors. Colour is measured by a particular wavelength of light reflect and producing sensation in the observer eye.

Sensitivity to differences improves with decreasing incident beam- and receptor-angle. We have no amendments or corrections for this standard. As the voice of the U. Since the refractive indexes nx and ny indirections x and y of the stressed polymer are different, the wavelengths of the two wave components tx and ty are also different, therefore the two waves will be out of phase when leaving.

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Link to Active This link will always route to the current Active version of the standard.

ASTM D1746 – 15

Birefringence is referred to as stress birefringence and its contributions are: The L, awtm, b values are correlated with L, a, b Chart. The control knob is adjusted so that the meter indicates the value assigned to the primary standard.

It is a fundamental property used for control the purity of the product and for optical parts design. All specular gloss values are based on a primary reference standard. Your Alert Profile lists the documents that will be monitored. Transparency is defined as the light diffused in a small angle range within 2.

Plastic Optical Testing – ASTM d | Polyhedron Labs

From the orientation of the molecules further conclusions regarding the material properties can be derived. The gloss value is directly read on the instrument. Already Subscribed to this document. A polished black glass with atm assign specular gloss value is Feedback Privacy Policy Feedback.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. We have no amendments or corrections for this standard.