Military Handbook - MIL-HDBK-17-4A: Composite Materials Handbook, Volume 4 - Metal Matrix Composites

COMPOSITE MATERIALS HANDBOOK
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Do not cite this document as a requirement. Approved for public release; distribution unlimited. This handbook is for guidance only. This handbook cannot be cited as a requirement. If it is, the con- tractor does not have to comply. Every effort has been made to reflect the latest information on polymer organic , metal, and ceramic composites. The handbook is continually reviewed and revised to ensure its completeness and cur- rentness. MIL-HDBK provides guidelines and material properties for polymer organic , metal, and ceramic matrix composite materials.

The first three volumes of this handbook currently focus on, but are not limited to, polymeric composites intended for aircraft and aerospace vehicles. This standardization handbook has been developed and is being maintained as a joint effort of the Department of Defense and the Federal Aviation Administration. Front Matter Pages i-xi. Pages Metal Matrix Composites. Processing Metal Matrix Composites.

Methodology and Structure of the Survey. Depending on the application, some structural design allowables will have to be determined empirically at the laminate and composite level, since MIL-HDBK does not provide these data.

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Additional information and properties will be added as they become available and are demonstrated to meet the guideline criteria. All data included herein are based on test specimens only. Test specimen dimensions conform with those specified for the particular test method which is used. Standard test methods are recommended where possible ASTM standards are the primary source. The designer and all users must be responsible for any translation of the data contained herein to other coupon dimensions, temperature, humidity, and other environmental conditions not covered in this document.

Problems such as scale-up effects and the influence of the test method selected on properties are also not addressed in this document. The manner in which S-basis values are used is also up to the discretion of the designer. In general, decisions concerning which properties to use for a specific application or design are the responsibility of the designer and are outside the scope of this handbook.

The first part is a description of the material. The material form section describes the material tested in the data set.

The information found under the heading of General Supplier Information is based on vendor supplied data. The information supplied by the vendor may vary slightly from that of the actual material tested in the data set. The purpose of the description is to provide a quick summary and guideline to the material and its usage. Specific requirements and each material s suitability must be determined by the end user. The second part of the data set contains pertinent information on the statistical analysis of the data.

It alerts the users to items such as pooling of data sets, outliers and batch variations. Sections are to be included for different types of fiber, e. In each section, the general characteristics of the type of fiber will be given, as well as an index of suppliers, designations, and abbreviations. For each specific fiber, data will be organized in the following manner. The X's in the subsection number will be determined by the type of fiber and the specific fiber described. For example, Section 3. The subsections for each resin will be the same as those in Chapter 2 given above Composite properties The remaining chapters of Volume 2 will provide data for prepreg, lamina, laminate, and joint properties.

There will be individual chapters for each family of composites based on fiber type. For example, Chapter 4 describes carbon fiber composites. Within each chapter, there is expected to be an index of suppliers, designations, and abbreviations. Sections will be included based on the resin type used with the fiber described in the chapter, e. Properties will be organized in the following manner for each specific composite: X.

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DescripciĆ³n:

Sep 21, MIL-HDBKA This Composite Materials Handbook Series, MIL-HDBK, are approved for Metal matrix compos- ites (MMC) and ceramic matrix composites (CMC), including covered in Volume 4 and Volume 5, respectively. 5. use in improving this document should be addressed to: U.S. Army. Jan 23, This Composite Materials Handbook Series, MIL-HDBK, are approved for use by Metal matrix compos- covered in Volume 4 and Volume 5, respectively. use in improving this document should be addressed to: U.S. Army Research .. GUIDELINES FOR PROPERTY TESTING OF COMPOSITES.

System No. Fiber properties and methods for obtaining them are discussed in Chapter 3. Resin properties are presented in Chapter 4. Methods for characterizing prepreg materials are discussed in Chapter 5 and properties and definitions for laminae and laminates are presented in Chapter 6. Properties for structural elements are presented in Chapter 7.

The statistical methods used in determining these properties are discussed in Chapter 8. Material system codes and laminate orientation codes are defined in this chapter Sign convention All compressive values, represented by a superscript c, are reported as positive numbers. Thus, a positive compression strength indicates failure due to a load applied in the opposite direction of a positive tensile failure Table formats The table formats for mechanical property data presentation are given in Tables 1.

Table 1. The following notes apply to this table: Handbook section title and number. Critical processing information, such as bleed or no-bleed, is included when it is neces- If a warning regarding data documentation is included for the data set, an asterisk follows the section title. The first set of information in a data section is a summary table containing information on the materials, processing, etc.

The box with a heavy border in the upper right-hand corner identifies the first summary table. The material identification is summarized by the fiber and matrix names. Material information is presented for the composite, the prepreg, the fiber, and the matrix. For fabric, information such as warp and fill fiber spacing is included when it is available. Glass transition temperature under dry and wet conditions is presented with the test method used to obtain these data See Volume 1, Section 6. Basic processing information is presented.

This includes the type of process, temperature, pressure, duration, and any other critical parameters for one or more processing steps. Any warning for limited data documentation is presented on each page of data presentation. On the first page of a data section, a warning is shown below the material identification block. The block below the material identification block presents various dates relevant to the fabrication and testing of the material. The date of data submittal determines the data documentation requirements that were used for the data set Volume 1, Section 2.

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Ranges of dates are presented where appropriate, such as a testing program which lasted several months. Lamina properties are summarized with the class of data provided for each property. The columns of the lamina property summary table define the environmental conditions. The first column contains room temperature ambient or dry data. Dry is used only if a drying procedure was used. Ambient refers to as-fabricated with subsequent storage in an ambient laboratory environment.

The remaining columns are ordered from lowest to highest moisture content and within a given moisture content, from lowest to highest temperature. The rows of the lamina summary table identify the type test and direction. The basic mechanical properties are included in each summary table. If data are available, additional properties, such as the following, are included: There is room temperature ambient data for longitudinal tension strength, modulus, and strain-to-failure, but not Poisson's ratio.

The strength data are fully approved, the modulus data are interim, and the strain-to-failure data are screening. The classes of data approval are defined in Volume 1, Section Fully approved data requires a minimum of thirty data points from at least five batches with more complete documentation; screening data represent a small number of data points from one batch, and interim data represent a minimum of fifteen specimens from at least three batches.

Certain test methods, for example, short beam shear, result only in screening data.