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3 edition of Effects of t-tabs and large deflections in DCB specimen tests found in the catalog.

Effects of t-tabs and large deflections in DCB specimen tests

Rajiv A. Naik

Effects of t-tabs and large deflections in DCB specimen tests

by Rajiv A. Naik

  • 147 Want to read
  • 37 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Composite materials.

  • Edition Notes

    StatementR. A. Naik, J. H. Crews, Jr., and K. N. Shivakumar.
    SeriesNASA technical memorandum -- 101677
    ContributionsCrews, John H., Shivakumar, K. N., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17096879M

    Handbook of Materials Failure Analysis: With Case Studies from the Aerospace and Automotive Industries provides a thorough understanding of the reasons materials fail in certain situations, covering important scenarios, including material defects, mechanical failure as a result of improper design, corrosion, surface fracture, and other environmental causes. With the development of finite element (FE) codes, numerical modelling of delamination is often considered to be somewhat commonplace in modern engineering. However, the readily available modelling techniques often undermine the truthful understanding of the nature of the problem. In particular, a critical review of the representativeness of the numerical model is often diverted to merely Cited by: 1.

    A practical test method for determining the mode I fracture toughness of adhesive joints with dissimilar substrates will be discussed. The test method is based on the familiar Double Cantilever Beam (DCB) specimen geometry, but overcomes limitations in existing techniques that preclude their use when testing joints with dissimilar by: 5. The delaminations were viewed at 0, 45, and 90 degree cuts through the delamination. The test setup used to produce the delaminations is shown in Figure The fastener is tightened by a torque wrench from the countersunk side of the fastener, similar to the production situation. The specimen is supported by ~3 in. diameter pipe.

    None of these possible errors are significant enough to eliminate the discrepancies and correct the analytical method. Rao and Acharya [9, 10] have proposed a procedure for small as well as large deflections considering nonzero slope at the crack-tip of the DCB specimens. Annual catalogue - PDF Free Download -


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Effects of t-tabs and large deflections in DCB specimen tests by Rajiv A. Naik Download PDF EPUB FB2

Cantilever beam (DCB) specimen to account for geometric nonlinearity effects due to large deflections and T-tabs. A new DCB data analysis procedure was developed to include the effects of these nonlinearities. The results of the analysis were evaluated by DCB tests performed for materials having a wide range of toughnesses.

A simple strength of materials analysis was developed for a double-cantilever beam (DCB) specimen to account for geometric nonlinearity effects due to large deflections and T-tabs. Abstract.

A simple strength of materials analysis was developed for a double cantilever beam (DCB) specimen to account for geometric nonlinearity effects due to large deflections and T-tabs.

A new DCB data analysis procedure was developed to include the effects of these nonlinearities. The results of the analysis were evaluated by performing DCB Cited by: 1.

Get this from a library. Effects of t-tabs and large deflections in DCB specimen tests. [R A Naik; J H Crews; K N Shivakumar; Langley Research Center.]. Effects of t-tabs and large deflections in DCB specimen tests. Hampton, Va.: [Springfield, Va: National Aeronautics and Space Administration, Langley Research Center ; For sale by the National Technical Information Service.

MLA Citation. Naik, R. and Crews, John H. and Shivakumar, K. and Langley Research Center. A simple strength of materials analysis was developed for a double-cantilever beam (DCB) specimen to account for geometric nonlinearity effects due to large deflections and T-tabs.

A new DCB data analysis procedure was developed to include the effects of these nonlinearities. An accurate method of measurement and data reduction of interfacial fracture toughness is essential to minimize the potential for errors and uncertainty.

The cracked sandwich beam (CSB) specimen along with compliance calibration (CC) method is commonly used to measure the opening mode fracture toughness of sandwich by: Rao and Acharya [9, 10] have proposed a procedure for small as well as large deflections considering nonzero slope at the crack-tip of the DCB specimens.

Motivated by the work of the above researchers, this paper examines the effect of rotational spring stiffness on the critical strain energy release rate useful for accurate failure load evaluation of delaminated by: 2.

This paper examines critical load and corresponding displacement of double cantilever beam (DCB) composite specimens made of glass/epoxy of three different layups. Experiments were conducted on these laminates, and the fracture energy, was evaluated considering the root rotation at the crack by: This is due to the bridging effect of the plate at diaphyseal portion of the bone.

In fact, the appropriate distance between locking screws in diaphyseal portion of the bone is necessary to provide effective load transferring between plate and locking screws. In diaphyseal bone-fracture fixation. A DCB specimen is prepared by cutting a crack along the neutral axis to a rectangular bar, and the crack length a is defined as the distance between the loading line and crack tip.

As shown in Fig. 1, when the load P is applied to the upper and lower cantilever portion of the specimen in opposite directions to each other, the loading-line compliance C L is derived by elementary beam theory as Cited by: The double cantilever beam (DCB) test is the most commonly used delamination test used for interlaminar fracture characterization under mode-I loading and has been standardized by the ASTM [12].The specimens used for the present study consist of different three layups, namely, unidirectional [0°] 6, angle ply [±45°] 3, and cross ply [0°/90°] 3 laminates made of E-glass/epoxy.

The conventional tapered DCB specimen loaded at the apex is shown to exhibit less stability than parallel DCB testpieces cracking under stiff testing conditions. A modified test with loadings applied at the thick base instead of near the apex is suggested.

Experiments agree with theory that this provides better cracking stability and easier control of the crack path, along with a wider range Cited by: The present paper deals with the strain energy release rate of three woven fabric reinforced thermoplastic composites. The interlaminar fracture behavior was studied using the mode I, double cantilever beam test and the mode II, end notched flexure test, in order to determine the energy required for the initiation and growth of an artificial by: 3.

This test method describes the determination of the opening Mode I interlaminar fracture toughness, GIc, of continuous fiber-reinforced composite materials using the double cantilever beam (DCB) specimen (Fig. This test method is limited to use with composites consisting of unidirectional carbon fiber and glass fiber tape laminates with brittle and tough single-phase polymer matrices.

Abstract. This paper describes measurements of unstable fracture and arrest in a steel, wedge-loaded DCB (double cantilever beam) test specimen with a blunted starting notch but which is well below the limiting speeds predicted by Broberg and Yoffe, specimen which accounts for Cited by: The central deflections of test specimens at this applied load are shown in Table 5.

The test deflections were somewhat smaller than the theoretical values; stiffness was reduced by 75%. The beams met the serviceability : Yun-Chul Choi, Doo-Sung Choi, Keum-Sung Park, Kang-Seok Lee.

H ashemi, A.J. K inloch, J.G. W illiams:?Corrections Needed in Double Cantilever Beam Tests for Assessing the Interlaminar Failure of Fibre-composites?, Journal of Materials Science Letters, 8, pp. () [2] R.A. N aik, J.H. C rews Jr., K.N.

S hivakumar:?Effects of T-Tabs and Large Deflections in DCB Specimen Tests. in: Composite. The sample used is a double cantilever beam (DCB) specimen, which is a rectangular, unidirectional laminated composite specimen containing a nonadhesive film on the midplane that serves as a delamination initiator.

Susceptibility to delamination is one of the major weaknesses. The wafer bond characterization is based on different methods and tests. Considered a high importance of the wafer are the successful bonded wafers without flaws. Those flaws can be caused by void formation in the interface due to unevenness or bond connection is characterized for wafer bond development or quality assessment of fabricated wafers and sensors.

Mode II delamination test method Mode III delamination test methods Mixed-mode delamination test methods An optical micrograph of a petrographic thin section of a rubber- toughened AS4lpolycarbonate composites.

The plastic zone is observed using cross polarized light. (after Parker and Yee []) Classical beam solution of DCB specimenCited by: 7.MICRO-DEVAL ABRASION OF AGGREGATE TXDOT DESIGNATION: TEXA CONSTRUCTION DIVISION 2 – 5 EFFECTIVE DATE: NOVEMBER Standard U.S. sieves, meeting the requirements of TexK.

Oven, capable of maintaining a temperature of either or both ± 5°F and ± 9°F. Balance, Class G2 in accordance with TexK. 4. PREPARING TEST SAMPLEFile Size: KB.On the stability of cracking in tapered DCB testpieces Y.

W. MAI, A. G. ATKINS and R. M. CADDELL The conventional tapered DCB specimen loaded at the apex is shown to exhibit less stability than parallel DCB testpieces cracking under stiff testing conditions. A modified test with loadings applied at the thick base instead of near the apex is.