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JIS K 7018:2019

JIS K 7018:2019

$30.55

Fiber-reinforced plastic composites-Determination of compressive properties
in the in-plane direction

Published By Publication Date Number of Pages
JIS 2019-07-22 47
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This Standard specifies four methods for determining compressive properties, in directions parallel to the plane of lamination, of fibre-reinforced plastic composites.

The compressive properties are of interest for specifications and quality-control purposes.

Four testing methods and seven types of specimen are described as follows.

See Table 1 for combination of test method, loading method, compression fixture and specimen shape, and the procedure for fitting the specimen to the compression fixture.

a) Test methods The following four methods are described:

— Method 1: provides shear loading of the specimen (gauge length unsupported).

— Method 2: provides mixed loading of shear loading and end loading of the specimen (gauge length unsupported).

— Method 3: provides end loading of the specimen with the buckling prevention fixture attached to the parallel-sided portion of the specimen and uses ? shaped test fixture.

NOTE For tabbed specimens that are end-loaded, some load is transferred into the specimen gauge length by shear through the tabs.

— Method 4: provides end loading of the specimen with the cylindrical support end fixture (gauge length unsupported).

b) Specimen shapes The following seven types of specimen are described:

— Type A specimen: rectangular cross-section, fixed thickness, end-tabbed, three sizes available (A1, A2, A3).

— Type B specimen: rectangular cross-section, range of thickness, untabbed or end-tabbed, three sizes available (B1, B2, B3).

— Type C specimen: dumbbell-shaped with a parallel-sided portion, untabbed.

The methods are suitable for fibre-reinforced thermoplastic and thermosetting plastic composites.

Unreinforced and particle-filled plastics, as well as those reinforced with short fibres (not more than 1 mm in length), are covered by JIS K 7181.

The methods are performed using specimens which may be machined according to JIS K 7144 from a test panel made in accordance with JIS K 7016-4 or equivalent methods.

The methods specify required dimensions for the specimen. Tests which are carried out on specimens of other dimensions, or on specimens which are prepared under different conditions, may produce results which are not comparable. Other factors, such as the speed of testing, the support fixture used and the condition of the specimens, can influence the results. Consequently, when comparative data are required, these factors must be carefully controlled and recorded.

Fiber-reinforced plastics are usually anisotropic. It is therefore often useful to cut test specimens in at least the two main directions of anisotropy, or in directions previously specified (for example a lengthwise direction associated with the production process).

NOTE The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 14126:1999 Fibre-reinforced plastic composites—Determination of compressive properties in the in-plane direction (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.

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JIS K 7018:2019
$30.55