1、Designation: D 3917 96 (Reapproved 2002)e1Standard Specification forDimensional Tolerance of Thermosetting Glass-ReinforcedPlastic Pultruded Shapes1This standard is issued under the fixed designation D 3917; the number immediately following the designation indicates the year oforiginal adoption or,
2、in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEEditorially revised 1.3 and 2.1.5 in March 2002.1. Scope *1.1 This specification defin
3、es tolerances applicable to stan-dard rods, bars, and shapes pultruded from thermosettingglass-reinforced plastics.1.2 These dimensional tolerances apply to all shapes speci-fied as “standard” by the pultrusion industry.1.3 Custom shapes and products designed for special appli-cations shall carry sp
4、ecific tolerances that may vary from thestandard because a change in type or amount of reinforcementused in a composite directly affects dimensions. The tolerancesmay be wider or tighter than associated with “standard” shapes.1.4 The following safety hazards caveat pertains only to thetest methods p
5、ortion, Section 4, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita
6、-tions prior to use.NOTE 1There is no similar or equivalent ISO standard.2. Terminology2.1 Definitions:2.1.1 Class 1 hollow shapeone whose void is round and 1in. (25 mm) or more in diameter and whose weight is equallydistributed on opposite sides of two or more equally spacedaxes.2.1.2 envelope diam
7、eterthe diameter of the smallest circlethat will completely enclose the cross section of the pultrudedproduct.2.1.3 flange bowthe deviation where the flange of thesection contacts the horizontal plane.2.1.4 flange camberthe deviation from the flange surfaceto the reference straight line.2.1.5 mean w
8、all thicknessthe average of two or more wallthickness measurements.2.1.6 straightnessthe perpendicular deviation of the sur-face contacting a horizontal plane.2.1.7 web bowthe deviation where the web of the sectioncontacts the horizontal plane.2.1.8 web camberthe deviation from the web surface tothe
9、 reference straight line.2.1.9 web-flange camberthe deviation from the free edgeof the flange to the reference straight line.3. Dimensional Criteria3.1 Dimensional tolerances for cross sections shall be pre-scribed in Table 1.3.2 Width/diameter for solid rods and bars and lengthtolerances for standa
10、rd rods, bars, and shapes shall be asprescribed in Table 2.3.3 Straightness tolerances shall be as prescribed in Table 3(also see 4.2).3.4 Twist tolerances for bars and shapes shall be as pre-scribed in Table 4 (also see 4.3).3.5 Flatness (flat surface) tolerances for bars, solid shapes,and semiholl
11、ow shapes shall be as prescribed in Table 5.3.6 Flatness (flat surface) tolerances of hollow shapes shallbe as prescribed in Table 6.3.7 Angularity tolerances for bars and shapes shall be asprescribed in Table 7 (also see 4.4).3.8 Camber tolerances for shapes shall be as prescribed inTable 8 (also s
12、ee 4.5).3.9 The selection, type, and amount of reinforcements, aswell as resin system used, directly affect dimensions. Toler-ances shall be agreed upon between the supplier and the user.4. Test Methods4.1 Obtain the specified tolerances with conventional mea-suring equipment. Measuring procedures,
13、gages, and fixturesshall be agreed upon between the supplier and the user.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.18 on ReinforcedThermosetting Plastics.Current edition approved November 10, 1996. Published M
14、ay 1997. Originallypublished as D 3917 80. Last previous edition D 3917 94.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Measure departure from straightness by p
15、lacing thesection on a level table so that the arc or departure fromstraightness is horizontal. Measure the depth of the arc with afeeler gage and a straightedge.4.3 Measure twist by placing the pultruded section on a flatsurface and measuring the maximum distance at any pointalong its length betwee
16、n the bottom surface of the section andthe flat surface. From this measurement, subtract the deviationTABLE 1 Cross-Sectional DimensionsStandard Rods, Bars, and ShapesStandard Pultruded Section with Envelope Dimension up to 10-in. (254-mm) DiameterSpecified Dimension, in. (mm)Solid Dimensions, 6in.
17、(mm)A,BAParallel to the LayeredConstruction (Perpendicularto Roving in allProducts)BPerpendicular to theLayered Construction(Mat and Mat-rovingProducts Only)C,DCWall Thickness CompletelyEnclosing Space 0.11 in.2(0.64 cm2) and Over(Eccentricity)E,F,GUp to 0.124 (3.15) incl 0.006 (0.15) 0.013 (0.33) 6
18、20 % of specified dimension0.125 to 0.249 (3.18 to 6.32) incl 0.007 (0.18) 0.018 (0.46) but not exceeding either0.250 to 0.499 (6.35 to 12.67) incl 0.008 (0.20) 0.027 (0.69) 60.100 (2.54) max or0.500 to 0.749 (12.70 to 19.02) incl 0.009 (0.23) 0.038 (0.97) 60.010 (0.25) min0.750 to 0.999 (19.05 to 2
19、5.37) incl 0.010 (0.25) 0.034 (0.86)1.000 to 1.499 (25.40 to 38.07) incl 0.012 (0.30) . 620 % of specified dimension1.500 to 1.999 (38.10 to 50.77) incl 0.014 (0.36) . but not exceeding either2.000 to 3.999 (50.80 to 101.57) incl 0.024 (0.61) . 60.100 (2.54) max or4.000 to 5.999 (101.60 to 152.37) i
20、ncl 0.034 (0.86) . 60.010 (0.25) minAThe tolerances applicable to a dimension composed of two or more component dimensions is the sum of the tolerances of the component dimensions if all of thecomponent dimensions are indicated.BAllowable deviation from specified dimension where 75 % or more of the
21、dimension is composite.CAt points less than 0.250 in. (6.35 mm) from base of leg, the tolerances of Dimension A are applicable.DWhen more than 25 % of the specified dimension is space, the tolerances shall be agreed upon between the purchaser and the supplier at the time the contractororder is enter
22、ed.EFor hollow or semihollow shapes, when the nominal thickness of one wall is three times or greater than that of the opposite wall, the wall thickness tolerance shallbe agreed upon between the purchaser and the supplier at the time the contract or order is entered.FWhere dimensions specified are o
23、utside and inside, rather than wall thickness itself, the allowable deviation (eccentricity) given in Column C applies to mean wallthickness.GTolerances in Column C take precedence over A dimension tolerances for walls which completely enclose 0.11 in.2(0.64 cm2) and over.TABLE 2 LengthStandard Rods
24、, Bars, and ShapesSpecified Diameter (Rods)Specified Width (Bars) Allowable Deviation from Specified Length, +in. (+mm), except as notedEnvelope Diameter (Shapes)in. (mm)Up to 12 ft (3.65 m)in Length, inclOver 12 to 30 ft (3.65to 9.14 m) in Length,inclOver 30 to 50 ft (9.14to 15.24 m) in Length,incl
25、Up to 0.499 (12.67) incl 618(63.18) 614 (66.35) 638 (69.52)0.500 to 1.249 (12.70 to 31.72) incl 618 (63.18) 614 (66.35) 638 (69.52)1.250 to 2.999 (31.75 to 76.17) incl18 (3.18)14 (6.35)38 (9.52)3.000 to 7.999 (76.20 to 203.17) incl316 (4.76)516 (7.94)716 (11.11)D 39172from true straightness of the s
26、ection. The remainder is thetwist. To convert the standard twist tolerance (degrees) to anequivalent linear value, multiply the tangent of the standardtolerance by the width of the surface of the section that is onthe flat surface.4.4 Measure angles with protractors or gages. A four-pointcontact sys
27、tem is illustrated in Fig. 1, two contact points beingas close to the angle vertex as practical and the others near theends of the respective surfaces forming the angle. Surfaceflatness is the controlling tolerance between these points ofmeasurement.4.5 Measure longitudinal curvature by placing the
28、sectionon a level table so that the arc or curvature is vertical. Measurethe depth of the arc with a feeler gage and a straightedge.5. Keywords5.1 dimensional tolerance; pultruded shapes; thermosettingplasticTABLE 3 StraightnessStandard Bars, Rods, and ShapesProductSpecified Diameter (Rods)Specified
29、 Width (Bars)Envelope Diameter (Shapes)Specified Thickness(Rectangles)Minimum Thickness(Shapes)Allowable Deviation (D) from Straight, in. (mm)in. (mm) in. (mm)In 1 ft (0.3 m) orLess of LengthIn Total Length of PieceRods and square, hexagonal,and octagonal barsall . 0.0125 (0.32) 0.0125 (0.32) 3 leng
30、th, ft (m)Rectangular bars Up to 1.499 (38.07), incl Up to 0.094 (2.4), incl 0.050 (1.3) 0.050 (1.3) 3 measured length, ft (m)0.095 (2.4) and over 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)1.500 (38.10) and over all 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)Shapes Up to 1.499 (38.0
31、7), incl Up to 0.094 (2.4), incl 0.050 (1.3) 0.050 (1.3) 3 measured length, ft (m)0.095 (2.4) and over 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)1.500 (38.10) and over all 0.050 (1.3) 0.050 (1.3) 3 measured length, ft (m)AAMeasured when weight of pultrusion minimizes the deviation by contac
32、t with flat surface.TABLE 4 TwistAStandard Bars and ShapesProductSpecified Width (Bars)Envelope Diameter (Shapes)Specified Thickness(Rectangles)Minimum Thickness(Shapes)Allowable Deviation from Straight, degin. (mm) in. (mm)In 1 ft (0.3 m)or Less of LengthIn Lengths Up to 20 ft (6 m)Bars Up to 1.499
33、 (38.07), incl all 1 (0.3) 1 3 measured length, ft (0.3 3 measuredlength, m) (7 max)1.500 to 2.999 (38.10 to76.17), inclall12 (0.15)12 3 measured length, ft (0.15 3 measuredlength, m) (5 max)3.000 (76.20) and over all13 (0.10)13 3 measured length, ft (0.10 3 measuredlength, m) (3 max)Shapes Up to 1.
34、499 (38.07), incl 0.100 (2.54) and up 1 (0.3) 1 3 measured length, ft (0.3 3 measuredlength, m) (7 max)1.500 to 2.999 (38.10 to76.17), incl0.100 (2.54) and up12 (0.15)12 3 measured length, ft (0.15 3 measuredlength, m) (5 max)3.000 (76.20) and over 0.100 (2.54) and up13 (0.10)13 3 measured length, f
35、t (0.10 3 measuredlength, m) (3 max)AMeasured when weight of pultrusion minimizes the deviation by contact with flat surface.D 39173TABLE 5 Flatness (Flat Surfaces)Standard Bars, Solid Shapes,and Semihollow ShapesSurface Width, in. (mm)Maximum AllowableDeviation (D), in. (mm)Up to 1 (25.4), incl 0.0
36、08 (0.20)Over 1 (25.4) 0.008 (0.20) 3 W, in. or mmIn any 1 in. (25.4 mm) of width 0.008 (0.20)TABLE 6 Flatness (Flat Surfaces)Standard Hollow ShapesMinimumThickness ofCompositeForming theSurface, in.(mm)Maximum Allowable Deviation (D), in. (mm)Widths up to1 in. (25.4mm), incl, orany 1-in. (25.4-mm)
37、Incrementof WiderSurfacesWidths over 1 in. (25.4 mm)Up to 0.187 (4.7), incl 0.012 (0.30) 0.012 (0.30) 3 W, in. or mm0.188 (4.8) and over 0.008 (0.20) 0.008 (0.20) 3 W, in. or mmTABLE 7 AngularityStandard Rods, Bars, and ShapesMinimum SpecifiedLeg Thickness,in. (mm)Allowable Deviation from SpecifiedA
38、ngle,6Angles 90 or less Angles more than 90Up to 0.749 (19.02), incl 112 112D 39174SUMMARY OF CHANGESThis section identifies the location of selected changes to this specification. For the convenience of the user,Committee D20 has highlighted those changes that may impact the use of this specificati
39、on. This section mayalso include descriptions of the changes or reasons for the changes, or both.D 3917 - 96 (02)e1:(1) Editorially revised paragraphs 1.3 and 2.15.D 3917 - 96:(1) Sections 1 and 3 were revised as was Footnote F in Table1.ASTM International takes no position respecting the validity o
40、f any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to
41、 revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters.
42、Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is c
43、opyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm
44、.org (e-mail); or through the ASTM website(www.astm.org).TABLE 8 CamberStandard ShapesProductEnvelope Diameter(Shapes)Minimum Thickness(Shapes)Allowable Deviation (D) from Straight, in. (mm)in. (mm) in. (mm)In 1 ft (0.3 m)or less of lengthIn total length of pieceShapes Up to 1.499 (38.07), incl Up to 0.094 (2.4), incl 0.040 (1.01) 0.040 (1.01) 3 measured length, ft (m)0.095 (2.4) and over 0.031 (0.794) 0.031 (0.794) 3 measured length, ft (m)1.500 (38.10) and over All 0.031 (0.794) 0.031 (0.794) 3 measured length, ft (m)FIG. 1 Four-Point Contact System for Angular MeasurementD 39175
