Alleviating stress concentrations by constant curvature flexure mechanisms

J.J. de Jong; D.M. Brouwer

Alleviating stress concentrations by constant curvature flexure mechanisms

Research output: Contribution to conference › Paper › peer-review

188 Downloads (Pure)

Abstract

In high precision applications flexures are used to accurately guide motion. Here it is essential to obtain sufficient off-axis support stiffness as to mitigate parasitic dynamics. When deflecting, stress concentrations limit the flexure thickness and hence the support stiffness and loadability of the structure. In this paper we present an approach to make the curvature and stress constant over the flexure such that its thickness and consequently its support-stiffness may be increased. We show this approach with a DiamondFlex element. This DiamondFlex structure supports the endpoint forces such that the guiding flexure only experiences a bending moment, which results in a constant curvature and stress over the length of the flexure. Application of this approach to a parallel flexure guidance enables a thickness increase of 45 %, increasing the support stiffness by a factor 2.5.

Original language	English
Pages	47-50
Number of pages	4
Publication status	Published - 30 May 2022
Event	22nd International Conference & Exhibition, EUSPEN 2022 - CERN, Geneva, Switzerland Duration: 30 May 2022 → 3 Jun 2022 Conference number: 22 https://www.euspen.eu/our-events/geneva-2022-programme/

Conference

Conference	22nd International Conference & Exhibition, EUSPEN 2022
Abbreviated title	EUSPEN
Country/Territory	Switzerland
City	Geneva
Period	30/05/22 → 3/06/22
Internet address	https://www.euspen.eu/our-events/geneva-2022-programme/

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 2 Zero Hunger

Keywords

Flexure mechanisms
Constant curvature
Optimization,
Precision engineering

Access to Document

20220330_EUSPEN_eAbst_CCFM_v8_corFinal published version, 523 KB

Cite this

@conference{0657ca49c4e94958a6c1a890c7500520,

title = "Alleviating stress concentrations by constant curvature flexure mechanisms",

abstract = "In high precision applications flexures are used to accurately guide motion. Here it is essential to obtain sufficient off-axis support stiffness as to mitigate parasitic dynamics. When deflecting, stress concentrations limit the flexure thickness and hence the support stiffness and loadability of the structure. In this paper we present an approach to make the curvature and stress constant over the flexure such that its thickness and consequently its support-stiffness may be increased. We show this approach with a DiamondFlex element. This DiamondFlex structure supports the endpoint forces such that the guiding flexure only experiences a bending moment, which results in a constant curvature and stress over the length of the flexure. Application of this approach to a parallel flexure guidance enables a thickness increase of 45 \%, increasing the support stiffness by a factor 2.5.",

keywords = "Flexure mechanisms, Constant curvature, Optimization,, Precision engineering",

author = "\{de Jong\}, J.J. and D.M. Brouwer",

note = "This version contain a few corrections to the grammar; 22nd International Conference \& Exhibition, EUSPEN 2022, EUSPEN ; Conference date: 30-05-2022 Through 03-06-2022",

year = "2022",

month = may,

day = "30",

language = "English",

pages = "47--50",

url = "https://www.euspen.eu/our-events/geneva-2022-programme/",

}

TY - CONF

T1 - Alleviating stress concentrations by constant curvature flexure mechanisms

AU - de Jong, J.J.

AU - Brouwer, D.M.

N1 - Conference code: 22

PY - 2022/5/30

Y1 - 2022/5/30

N2 - In high precision applications flexures are used to accurately guide motion. Here it is essential to obtain sufficient off-axis support stiffness as to mitigate parasitic dynamics. When deflecting, stress concentrations limit the flexure thickness and hence the support stiffness and loadability of the structure. In this paper we present an approach to make the curvature and stress constant over the flexure such that its thickness and consequently its support-stiffness may be increased. We show this approach with a DiamondFlex element. This DiamondFlex structure supports the endpoint forces such that the guiding flexure only experiences a bending moment, which results in a constant curvature and stress over the length of the flexure. Application of this approach to a parallel flexure guidance enables a thickness increase of 45 %, increasing the support stiffness by a factor 2.5.

AB - In high precision applications flexures are used to accurately guide motion. Here it is essential to obtain sufficient off-axis support stiffness as to mitigate parasitic dynamics. When deflecting, stress concentrations limit the flexure thickness and hence the support stiffness and loadability of the structure. In this paper we present an approach to make the curvature and stress constant over the flexure such that its thickness and consequently its support-stiffness may be increased. We show this approach with a DiamondFlex element. This DiamondFlex structure supports the endpoint forces such that the guiding flexure only experiences a bending moment, which results in a constant curvature and stress over the length of the flexure. Application of this approach to a parallel flexure guidance enables a thickness increase of 45 %, increasing the support stiffness by a factor 2.5.

KW - Flexure mechanisms

KW - Constant curvature

KW - Optimization,

KW - Precision engineering

M3 - Paper

SP - 47

EP - 50

T2 - 22nd International Conference & Exhibition, EUSPEN 2022

Y2 - 30 May 2022 through 3 June 2022

ER -

Alleviating stress concentrations by constant curvature flexure mechanisms

Abstract

Conference

UN SDGs

Keywords

Access to Document

Fingerprint

Cite this