### Abstract

The tensile strength of carbon/epoxy composite rods used in tension-leg platforms, prestressed concrete, and post-tensioned concrete, for example, is highly sensitive to the method of load introduction to the ends of the rods by grips or anchors. The present paper analyzes the stresses imparted by the grips to a round-sectioned carbon/epoxy rod by various distributions of shear traction applied to the sides of the rod. The stresses were obtained using the linear theory of elasticity of anisotropic body and a series solution. It was found that severe concentrations of longitudinal and hoop stresses can exist in the rod near the loaded edges of the grips. Due to the singular nature of stresses at the grip edge, it is suggested to use an average stress criterion to estimate the tensile strength of the gripped rod. By applying the average stress criterion to a gripped intermediate modulus carbon/epoxy rod, a clear inverse relationship is shown between the tensile strength and the diameter of the rod. This relationship is independent of any size-dependent variation in inherent material strength. By changing the distribution of the applied shear tractions, the high stress concentrations can be mitigated, resulting in higher strength composite rods.

Original language | English (US) |
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Title of host publication | SAMPE '07 |

Subtitle of host publication | M and P - From Coast to Coast and Around the World; Conference Proceedings |

State | Published - Oct 1 2007 |

Event | SAMPE '07: M and P - From Coast to Coast and Around the World - Baltimore, MD, United States Duration: Jun 3 2007 → Jun 7 2007 |

### Publication series

Name | International SAMPE Symposium and Exhibition (Proceedings) |
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Volume | 52 |

ISSN (Print) | 0891-0138 |

### Other

Other | SAMPE '07: M and P - From Coast to Coast and Around the World |
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Country | United States |

City | Baltimore, MD |

Period | 6/3/07 → 6/7/07 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering

### Cite this

*SAMPE '07: M and P - From Coast to Coast and Around the World; Conference Proceedings*(International SAMPE Symposium and Exhibition (Proceedings); Vol. 52).

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*SAMPE '07: M and P - From Coast to Coast and Around the World; Conference Proceedings.*International SAMPE Symposium and Exhibition (Proceedings), vol. 52, SAMPE '07: M and P - From Coast to Coast and Around the World, Baltimore, MD, United States, 6/3/07.

**Tensile strength analysis of gripped carbon/epoxy rods.** / Portnov, G.; Bakis, C. E.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Tensile strength analysis of gripped carbon/epoxy rods

AU - Portnov, G.

AU - Bakis, C. E.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - The tensile strength of carbon/epoxy composite rods used in tension-leg platforms, prestressed concrete, and post-tensioned concrete, for example, is highly sensitive to the method of load introduction to the ends of the rods by grips or anchors. The present paper analyzes the stresses imparted by the grips to a round-sectioned carbon/epoxy rod by various distributions of shear traction applied to the sides of the rod. The stresses were obtained using the linear theory of elasticity of anisotropic body and a series solution. It was found that severe concentrations of longitudinal and hoop stresses can exist in the rod near the loaded edges of the grips. Due to the singular nature of stresses at the grip edge, it is suggested to use an average stress criterion to estimate the tensile strength of the gripped rod. By applying the average stress criterion to a gripped intermediate modulus carbon/epoxy rod, a clear inverse relationship is shown between the tensile strength and the diameter of the rod. This relationship is independent of any size-dependent variation in inherent material strength. By changing the distribution of the applied shear tractions, the high stress concentrations can be mitigated, resulting in higher strength composite rods.

AB - The tensile strength of carbon/epoxy composite rods used in tension-leg platforms, prestressed concrete, and post-tensioned concrete, for example, is highly sensitive to the method of load introduction to the ends of the rods by grips or anchors. The present paper analyzes the stresses imparted by the grips to a round-sectioned carbon/epoxy rod by various distributions of shear traction applied to the sides of the rod. The stresses were obtained using the linear theory of elasticity of anisotropic body and a series solution. It was found that severe concentrations of longitudinal and hoop stresses can exist in the rod near the loaded edges of the grips. Due to the singular nature of stresses at the grip edge, it is suggested to use an average stress criterion to estimate the tensile strength of the gripped rod. By applying the average stress criterion to a gripped intermediate modulus carbon/epoxy rod, a clear inverse relationship is shown between the tensile strength and the diameter of the rod. This relationship is independent of any size-dependent variation in inherent material strength. By changing the distribution of the applied shear tractions, the high stress concentrations can be mitigated, resulting in higher strength composite rods.

UR - http://www.scopus.com/inward/record.url?scp=34748840188&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34748840188&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:34748840188

SN - 1934551007

SN - 9781934551004

T3 - International SAMPE Symposium and Exhibition (Proceedings)

BT - SAMPE '07

ER -