Standard Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials

Importancia y uso:

5.1 Procedure A is designed to produce moisture diffusion material property data that may be used as follows:

5.1.1 To determine approximate exposure times for coupon conditioning in Procedures B-E, Y, and Z;

5.1.2 As input to moisture prediction analysis computer codes; or

5.1.3 For making qualitative decisions on material selection or performance under environmental exposure to various forms of moisture.

5.2 Procedures B-E are designed to condition test coupons to a specified environmental condition or equilibrium state prior to other material property testing (including, but not limited to, mechanical testing).

5.3 Procedures Y-Z are designed to determine the loss of moisture content due to removal of a test coupon from the conditioning chamber (such as for strain gauge bonding) or due to heating of the test coupon prior to and during mechanical loading.

5.4 A single pair of tests on thin and thick specimens using Procedure A provides the moisture diffusivity constant, D_z, and the moisture equilibrium content, M_m, at the given moisture exposure level and temperature. Multiple tests at differing temperatures are required to establish the dependence of D_z on temperature. Multiple tests at differing moisture exposure levels are required to establish the dependence of M_m on moisture exposure level.

Note 1: For many polymer matrix composites, the moisture diffusivity is usually only weakly related to relative humidity and is often assumed to be a function only of temperature, usually following an Arrhenius-type exponential relation with inverse absolute temperature. For many of these materials, moisture equilibrium content is only weakly related to temperature and is usually assumed to be a function only of relative humidity (1).

5.5 Vapor-exposure testing shall be used to condition the specimen when the in-service environmental condition is a vapor such as humid air. Immersion in a liquid bath should be used to simulate vapor exposure only when apparent absorption properties are desired for qualitative purposes. Properties determined in the latter manner shall be reported as apparent properties.

Note 2: For many polymer matrix composites, the moisture absorption properties under atmospheric humid conditions are generally not equivalent to exposure either to liquid immersion or to pressurized steam. These latter environments may have different material diffusion characteristics.

Subcomité:

D30.04

Referida por:

D7914_D7914M-21, D6772_D6772M-22, D7522_D7522M-21, D7028-07R24, D7617_D7617M-11R17, C0480_C0480M-16R24, D8101_D8101M-18, D7332_D7332M-23, D3039_D3039M-17, C0271_C0271M-16R22E01, D3171-22, D7249_D7249M-20, D2344_D2344M-22, D3518_D3518M-18, D6415_D6415M-22, C0364_C0364M-16R24, D5961_D5961M-23, D3410_D3410M-16E01, D5528_D5528M-21, D7615_D7615M-23, D7337_D7337M-12R19, D6484_D6484M-23, D7913_D7913M-14R20, C0273_C0273M-20, D4255_D4255M-20E01, D8066_D8066M-23, C0393_C0393M-20, D6641_D6641M-23, D8285_D8285M-19, D8067_D8067M-17, D7264_D7264M-21, D7565_D7565M-10R17, D5450_D5450M-22, D5687_D5687M-20, D3800-22, F1645_F1645M-22, D6873_D6873M-23, D7205_D7205M-21, C0366_C0366M-16R22E01, D7905_D7905M-19E01, D7616_D7616M-11R23, D7336_D7336M-22, D5467_D5467M-97R17, D8131_D8131M-23, D7291_D7291M-22, D8454_D8454M-22, D5449_D5449M-22, D6115-97R19, D5448_D5448M-22, D6742_D6742M-23, D5379_D5379M-19E01, D8510_D8510M-23, D8287_D8287M-22, D6856_D6856M-23, D7248_D7248M-23, C0365_C0365M-22, D3039_D3039M-17, D7137_D7137M-23, C0394_C0394M-16R24, D5766_D5766M-23, D8387_D8387M-23, C0363_C0363M-24, D7078_D7078M-20E01, C0297_C0297M-16R24, D6790_D6790M-22, F3489-23, D8337_D8337M-21, D3479_D3479M-19R23, D6671_D6671M-22, D7136_D7136M-20, D4762-23, E1922_E1922M-22, D7766_D7766M-23, D6264_D6264M-23

Volúmen:

15.03

Número ICS:

83.140.20 (Laminated sheets)

Palabras clave:

conditioning; moisture absorption; moisture desorption; moisture diffusivity; moisture equilibrium; polymer matrix composite materials ;