Member Stiffness and Contact Pressure Distribution of Bolted Joints

Lehnhoff, T. F.; Ko, Kwang-Il; McKay, Matthew L.

doi:10.1115/1.2919413

Cited by 61 publications

(31 citation statements)

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“…Secondly the washer/bolt head is assumed to be rigid which is also not the case. In papers where these assumptions are not used, see e.g., [5] or [1], the general result is, as in the present paper, that we find smaller values for the member stiffness.…”

Section: Solutions For Large Plate Member Widthsmentioning

confidence: 51%

On prestress stiffness analysis of bolt-plate contact assemblies

Pedersen

2007

Arch Appl Mech

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Bolt connections are among the most important connections used in structures. The stiffnesses of the bolt and of the connected members are the primary qualities that control the lifetime of the connection. The stiffness of the bolt can be estimated rather easily, in contrast to the member stiffness, but with finite element (FE) and contact analysis, it is possible to find the stiffness of the member. In the case of many connections and for practical applications, it is not suitable to make a full FE analysis. The purpose of the present paper is to find simplified expressions for the stiffness of the member, including the case when the width of the member is limited. The calculation of the stiffness is based on the FE, including the solution to the contact problem, and we express the stiffness as a function of the elastic energy in the structure, whereby the definition of the displacements related to the stiffness is circumvented. The contact analysis is performed using a method where iterations are not necessary, and the results are compared to alternative available results. New practical formulas for the stiffnesses are suggested.

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Section: Solutions For Large Plate Member Widthsmentioning

confidence: 51%

On prestress stiffness analysis of bolt-plate contact assemblies

Pedersen

2007

Arch Appl Mech

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“…Lehnhoff et al [17] proposed an analytical model to calculate the member stiffness and the stress distribution of bolted joints with various bolt sizes. They assumed a uniform pressure with conical envelope under the bolt head.…”

Section: Introductionmentioning

confidence: 99%

Mathematical representation of bolted-joint stiffness: A new suggested model

2011

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Joint member stiffness in a bolted connection directly influences the safety of a design in regard to both static and fatigue loading, as well as in the prevention of separation in the connection. This work provides a new simple model for computing the member stiffness in bolted connections for both fully and partially developed stress envelope fields. The new model is built using a stress distribution polynomial of third order. Finite element analysis (FEA) is performed for some joints geometries, and the results are used to estimate the best analytical envelope angle in the proposed analytical model that gives suitable convergence between the compared results. An experimental effort is exerted to validate the accuracy of a suggested model. When analytical results are compared with FEA results and experimental data, the maximum absolute percentage errors are found to be 2.69 and 14.69, respectively. Also, a good agreement is obtained when the analytical results are compared with other researchers' results.

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“…Unfortunately, this approach appeared to be irrealistic and inaccurate as shown by Guillot [3], Massol [7] and Zadoks [8]. Lehnhoff et al [5,9,10] calculated an average equivalent displacement for the nodes at the contact zone to simulate this interaction.…”

Section: Introductionmentioning

confidence: 98%

“…A benchmark of developed approaches anterior to 1990 can be found in Lenhoff et al [5]. However, it was the development of finite elements which led up to more accurate models.…”

Section: Introductionmentioning

confidence: 99%