Koichi Yokozeki
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View article: A joint effort: Probabilistic methods for hybrid joint strength prediction
A joint effort: Probabilistic methods for hybrid joint strength prediction Open
This study investigates the strength prediction of hybrid joints that combine adhesive bonding with mechanical fasteners using probabilistic methods, focusing on four cold-curing adhesives: DP460, SW7240, SF479, and S370, which exhibit var…
View article: Role of bolt pretension in determining stress and load-bearing capacity of hybrid joints
Role of bolt pretension in determining stress and load-bearing capacity of hybrid joints Open
This study investigated the effect of bolt pretension on the load-bearing capacity and stress distribution of hybrid joints combining adhesive bonding and mechanical fastening, using two brittle epoxies (SW7240 andDP460) and one ductile po…
View article: A Joint Effort: Probabilistic Methods for Hybrid Joint Strength Prediction
A Joint Effort: Probabilistic Methods for Hybrid Joint Strength Prediction Open
View article: Predicting the Adhesive Layer Thickness in Hybrid Joints Involving Pre-Tensioned Bolts
Predicting the Adhesive Layer Thickness in Hybrid Joints Involving Pre-Tensioned Bolts Open
While most academic studies focus on the properties of cured joints, this research addresses the manufacturing process of hybrid joints in their uncured state. Hybrid joints that combine adhesive bonding with pre-tensioned bolts exhibit su…
View article: Pretension Effects on Hybrid Bolted-Bonded Joints
Pretension Effects on Hybrid Bolted-Bonded Joints Open
View article: EXPERIMENTAL FATIGUE EVALUATION OF VARIOUS ORTHOTROPIC STEEL DECK TYPES BASED ON LOCAL STRESSE STATES UNDER MOVING TRAFFIC LOADS
EXPERIMENTAL FATIGUE EVALUATION OF VARIOUS ORTHOTROPIC STEEL DECK TYPES BASED ON LOCAL STRESSE STATES UNDER MOVING TRAFFIC LOADS Open
実働交通荷重下で生じる最も疲労に厳しい条件下での各種鋼床版の疲労耐久性を明らかにし,比較することを目的とし,FEAを用いて試験条件を検討したうえで定点載荷疲労試験を実施した.疲労試験の荷重位置は縦リブと横リブとの交差部に大きなホットスポット応力を発生させる位置とし,試験荷重範囲は実働交通荷重下でのホットスポット応力範囲を再現できるように割り増した.試験結果から,縦リブと横リブとの交差部で横リブにスリットを設けない交差部は疲労耐久性が高く,特に縦リブに平リブを用いた構造は,設…
View article: Study on fatigue strength in terms of stresses measured by strain gauges attached with its ends to be at weld toes
Study on fatigue strength in terms of stresses measured by strain gauges attached with its ends to be at weld toes Open
To evaluate stresses including stress concentration at weld toes for fatigue evaluation of complex shape welded structures such as railway bogie frames, previous studies proposed the stress assessment procedure through measuring strains of…
View article: Fatigue strength in terms of stresses measured by gauges attached with its ends to be at weld toes
Fatigue strength in terms of stresses measured by gauges attached with its ends to be at weld toes Open
To evaluate stresses including stress concentration at weld toes for fatigue evaluation of complex shape welded structures such as railway bogie frames, previous studies proposed the stress assessment procedure through measuring strains of…
View article: Improvement of fatigue strength of welded joints in railway bogie frames through ultrasonic impact
Improvement of fatigue strength of welded joints in railway bogie frames through ultrasonic impact Open
Ultrasonic impact treatment (UIT) is an effective method for improving the fatigue strength of welded joints. In this study, the applicability of UIT to the welded joints of a railway bogie frame was assessed. Fatigue tests and finite elem…
View article: A study on fatigue evaluation method for railway bogie frames based on stress assessments
A study on fatigue evaluation method for railway bogie frames based on stress assessments Open
In order to evaluate stresses including stress concentration at weld toes for fatigue evaluation of complex-shape welded structures such as railway bogie frames, previous studies proposed the stress assessment procedure through measuring s…
View article: FATIGUE ENHANCEMENT OF LONGITUDINAL-TO-TRANSVERSE RIB CONNECTION IN ORTHOTROPIC STEEL DECK
FATIGUE ENHANCEMENT OF LONGITUDINAL-TO-TRANSVERSE RIB CONNECTION IN ORTHOTROPIC STEEL DECK Open
高疲労強度の鋼床版縦横リブ交差部を見いだすため，縦リブ形状および横リブスリット有無を変更したいくつかの交差部を対象に，有限要素解析(FEA)を用いて，疲労に対して支配的となる載荷位置を確かめたうえで疲労強度を評価・比較した．その結果，何れの交差部形式でも支配的となる載荷ケースは，着目する交差部直上を中心とした荷重配置ではないこと，縦リブにUリブおよび平リブを用いた鋼床版では，横リブウェブのスリット省略によって局部応力範囲が75%，58%低減されることがわかった．さらにUリブ…