Investigation of combined stress state failure criterion for glass fiber/epoxy interface by the cruciform specimen method

S Ogihara, J Koyanagi - Composites Science and Technology, 2010 - Elsevier
The interfacial failure criterion under combined stress state in a glass fiber/epoxy composite
is investigated by the cruciform specimen method. Experiments were conducted by using …

Time and temperature dependence of carbon/epoxy interface strength

J Koyanagi, S Yoneyama, A Nemoto… - Composites Science and …, 2010 - Elsevier
Characterization of fiber/matrix interface is essential for the understanding of long-term
properties of fiber reinforced composite materials. In this research, time and temperature …

Identification of invisible fatigue damage of thermosetting epoxy resin by non-destructive thermal measurement using entropy generation

N Kudo, R Fujita, Y Oya, T Sakai… - Advanced Composite …, 2024 - Taylor & Francis
To quantify carbon fiber-reinforced plastic (CFRP) fatigue, herein, we investigate the
relationship between fatigue and an epoxy resin used in CFRPs. Generally, fatigue is …

A comprehensive model for determining tensile strengths of various unidirectional composites

J Koyanagi, H Hatta, M Kotani… - Journal of Composite …, 2009 - journals.sagepub.com
Simultaneous fiber-failure (SFF) model that determines tensile strengths for various systems
of unidirectional composites comprehensively is presented. The SFF derives the strength of …

Temperature dependence of interfacial strength of carbon-fiber-reinforced temperature-resistant polymer composites

M Sato, J Koyanagi, X Lu, Y Kubota, Y Ishida… - Composite Structures, 2018 - Elsevier
In the present study, the temperature-dependence of fiber/matrix interfacial strength is
discussed through temperature-controlled microbond testing and its numerical simulation …

Evaluation of the interfacial strength of carbon-fiber-reinforced temperature-resistant polymer composites by the micro-droplet test

M Sato, E Imai, J Koyanagi, Y Ishida… - Advanced Composite …, 2017 - Taylor & Francis
This paper presents an evaluation method for the fiber/matrix interfacial strength. The
interfacial strength is determined by comparing experimental data with numerical …

Progressive damage of a unidirectional composite with a viscoelastic matrix, observations and modelling

N Kotelnikova-Weiler, O Baverel, N Ducoulombier… - Composite …, 2018 - Elsevier
In this paper phenomenological observations of the creep rupture under maintained
combined traction and torsion loading are first presented. They show the importance of the …

A numerical simulation of time-dependent interface failure under shear and compressive loads in single-fiber composites

J Koyanagi, A Yoshimura, H Kawada, Y Aoki - Applied Composite …, 2010 - Springer
We performed a numerical simulation of a time-dependent interfacial failure accompanied
by a fiber failure, and examined their evolution under shear and compressive loads in single …

Tensile strength at elevated temperature and its applicability as an accelerated testing methodology for unidirectional composites

J Koyanagi, M Nakada, Y Miyano - Mechanics of Time-Dependent …, 2012 - Springer
The applicability of a macroscopic time-temperature superposition principle (TTSP) to
unidirectional composite strength is discussed based on the microscopic Simultaneous …

Time dependency of carbon/epoxy interface strength

J Koyanagi, S Yoneyama, K Eri, PD Shah - Composite structures, 2010 - Elsevier
This paper describes time-dependent fiber/matrix interfacial strength of carbon fiber
reinforced polymeric composite. The time-dependent interfacial strength is extracted from …