ASTM_E_1290_-_08e1.pdf

ASy EE1290-081s=4W0.02WTEST SPECIMEN3R8min】RAM.6 PIN DIA.0.101.1 PIN DIA.DISPLACEMENT63/GAGETESTW(min)0.15FIXTUREBOSSES FORSPRINGS ORW(min)-RUBBER BANDS2D12.7 mm(0.5 in.)and W/B=4 for B s12.7 mmcorners may be cut off sufficiently to accommodate seating of(0.5 in.)If a 1930-MPa(280 000-psi)yield strength maragingthe clip gage in specimens less than 9.5 mm(0.375 in.)thick.E1290-08e1SPECIMEN13025.0ATTACHABLEKNIFE EDGE0013NOTEKNIFE EDGE WIDTH=CLIP GAGE ARM WIDTH(a)SCREW HD.DIA5NOTE2032(MIN)NOTCH1257.810045日60NoTE 1-Dimensions are in inches.NorE 2-Effective gage length=2C+Screw Thread Diameter W/2.1.5(This will always be greater than the gage length specified in Test MethodE399,E399.1.)NoTE 3-Dimension shown corresponds to clip gage spacer blockRdimension in Test Method E399.Annex A1.90Metric EquivalentsKnife Edgein.0.0320.060.070.1000.125See FIG.4mm0.811.51.82.543.1857NOTE6一(b)NoTE 1-All dimensions in mm.45060FIG.5 Clip Gage Design for 8-mm(0.3-in.)and More Working090Range(see 6.4.3.)dimension z(see 9.2).Alternatively,when the opening dis-0.06placements on C(T)specimens are made on or within 0.002NOTE 50.2500.05W of the load line,it may be assumed that z=0.For A(B)0.200specimens,special measurements must be taken to establishlocation of the clip gage knife edges with respect to the crackNOTE 4-Dimensions in inchesplane.Paragraphs 8.9.4 and 8.9.5 provide more detail onNorE 5-Gage length shown corresponds to clip gage spacer blockdimensions shown in Test Method E399,Annex Al,but other gagerequired measurements.lengths may be used provided they are appropriate to the specimen.6.4.2 The clip gage recommended in Test Method E399 mayNoTE 6-For starter notch configurations see Fig.8be used in cases where the total expected displacement is 2.5Metric Equivalentsmm(0.1 in.)or less.Sensitivity and linearity requirementsin.0.0500.0600.2000.250specified in Test Method E399,shall be met over the fullmm1.31.55.16.4working range of the gage.In addition,the gage is to beFIG.4 Knife Edges for Location of Clip Gagescalibrated to within 1%of the working range.6.4.3 For cases where a linear working range of up to 8 mmAttention should be given to achieving good alignment through(0.3 in.)or more is needed,an enlarged gage such as thatcareful machining of all auxiliary gripping fixtures.shown in Fig.5 can be used.Both linearity and accuracy of the6.4 Displacement Measuring Devices:equipment or system used shall be demonstrated to be within6.4.1 Displacement measuring gages are used to measure1%of the working range of the equipment.opening displacements on SE(B)specimens at either knife6.4.4 The seating between the clip gage and knife edgesedges a distance z beyond the crack mouth,Fig.4a,or at theshall be firm and free from friction drag.crack mouth(z=0)in the case of integral knife edges,Fig.4b.6.5 Force Measurement-The sensitivity of the force sens-For C(T)specimens,where the opening displacement is noting device shall be sufficient to avoid distortion caused by overmeasured on the load line,the difference between the load lineamplification and the device shall have linearity identical toand the displacement measuring point shall constitute thethat for the displacement signal.The combination of force5