ASTM D2344 D2344M-2016 Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates《聚合物基体复合材料及其层压件短梁强度的标准试验方法》.pdf
《ASTM D2344 D2344M-2016 Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates《聚合物基体复合材料及其层压件短梁强度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2344 D2344M-2016 Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates《聚合物基体复合材料及其层压件短梁强度的标准试验方法》.pdf(10页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D2344/D2344M 13D2344/D2344M 16Standard Test Method forShort-Beam Strength of Polymer Matrix Composite Materialsand Their Laminates1This standard is issued under the fixed designation D2344/D2344M; the number immediately following the designation indicates theyear of original adoption or
2、, in the case of revision, the year of last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Sc
3、ope1.1 This test method determines the short-beam strength of high-modulus fiber-reinforced composite materials. The specimenis a short beam machined from a curved or a flat laminate up to 6.00 mm 0.25 in. thick. The beam is loaded in three-pointbending.1.2 Application of this test method is limited
4、 to continuous- or discontinuous-fiber-reinforced polymer matrix composites, forwhich the elastic properties are balanced and symmetric with respect to the longitudinal axis of the beam.1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values
5、 stated in eachsystem may not be exact equivalents; therefore, each system must be used independently of the other. Combining values from thetwo systems may result in nonconformance with the standard.1.4 This standard does not purport to address all of the safety concerns, if any, associated with it
6、s use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D792 Test Methods for Density and Specific Gravity (Relative Density) of P
7、lastics by DisplacementD883 Terminology Relating to PlasticsD2584 Test Method for Ignition Loss of Cured Reinforced ResinsD2734 Test Methods for Void Content of Reinforced PlasticsD3171 Test Methods for Constituent Content of Composite MaterialsD3878 Terminology for Composite MaterialsD5229/D5229M T
8、est Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix CompositeMaterialsD5687/D5687M Guide for Preparation of Flat Composite Panels with Processing Guidelines for Specimen PreparationE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating
9、 to Methods of Mechanical TestingE18 Test Methods for Rockwell Hardness of Metallic MaterialsE122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot orProcessE177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE
10、456 Terminology Relating to Quality and StatisticsE1309 Guide for Identification of Fiber-Reinforced Polymer-Matrix Composite Materials in Databases (Withdrawn 2015)3E1434 Guide for Recording Mechanical Test Data of Fiber-Reinforced Composite Materials in Databases (Withdrawn 2015)31 This test metho
11、d is under the jurisdiction of ASTM Committee D30 on Composite Materials and is the direct responsibility of Subcommittee D30.04 on Lamina andLaminate Test Methods.Current edition approved Oct. 1, 2013July 1, 2016. Published December 2013July 2016. Originally approved in 1965. Last previous edition
12、approved in 20062013 asD2344 00D2344 13.R06. DOI: 10.1520/D2344_D2344M-13.10.1520/D2344_D2344M-16.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Docum
13、ent Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becausei
14、t may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr
15、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1E1471 Guide for Identification of Fibers, Fillers, and Core Materials in Computerized Material Property Databases (Withdrawn2015)33. Terminology3.1 DefinitionsTerminology D3878 defines the terms relating to high-modulus fiber
16、s and their composites. Terminology D883defines terms relating to plastics. Terminology E6 defines terms relating to mechanical testing. Terminology E456 and PracticeE177 define terms relating to statistics. In the event of a conflict between definitions, Terminology D3878 shall have precedenceover
17、the other documents.NOTE 1If the term represents a physical quantity, its analytical dimensions are stated immediately following the term (or letter symbol) infundamental dimension form, using the following ASTM standard symbology for fundamental dimensions, shown within square brackets: M for mass,
18、L for length, T for time, for thermodynamic temperature, and nd for nondimensional quantities. Use of these symbols is restricted to analyticaldimensions when used with square brackets, as the symbols may have other definitions when used without the brackets.3.2 Definitions of Terms Specific to This
19、 Standard:3.2.1 balanced laminate, na continuous fiber-reinforced laminate in which each + lamina, measured with respect to thelaminate reference axis, is balanced by a lamina of the same material (for example, 0/+45/45/+45/45/0).3.2.2 short-beam strength, nthe shear stress as calculated in Eq 1, de
20、veloped at the specimen mid-plane at the failure eventspecified in 11.6.3.2.2.1 DiscussionAlthough shear is the dominant applied loading in this test method, the internal stresses are complex and a variety of failure modescan occur. Elasticity solutions by Berg et al (1)4, Whitney (2), and Sullivan
21、and Van Oene (3) have all demonstrated inadequaciesin classical beam theory in defining the stress state in the short-beam configuration. These solutions show that the parabolicshear-stress distribution as predicted by Eq 1 only occurs, and then not exactly, on planes midway between the loading nose
22、 andsupport points.Away from these planes, the stress distributions become skewed, with peak stresses occurring near the loading noseand support points. Of particular significance is the stress state local to the loading nose in which the severe shear-stressconcentration combined with transverse and
23、 in-plane compressive stresses has been shown to initiate failure. However, for themore ductile matrices, plastic yielding may alleviate the situation under the loading nose (1) and allow other failure modes to occursuch as bottom surface fiber tension (2). Consequently, unless mid-plane interlamina
24、r failure has been clearly observed, theshort-beam strength determined from this test method cannot be attributed to a shear property, and the use of Eq 1 will not yieldan accurate value for shear strength.3.2.3 symmetric laminate, na continuous fiber-reinforced laminate in which each ply above the
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD2344D2344M2016STANDARDTESTMETHODFORSHORTBEAMSTRENGTHOFPOLYMERMATRIXCOMPOSITEMATERIALSANDTHEIRLAMINATES

链接地址:http://www.mydoc123.com/p-512713.html