Evaluation of Machining Properties of Short Bamboo Fiber-Based Green Composites Using CNC Drilling Process

2021 ◽  
pp. 123-132
Author(s):  
Shubham B. Patil ◽  
Jagadish ◽  
Shailesh Vaidya ◽  
Satish Kumar Adapa
Keyword(s):  
Bamboo Fiber ◽  
Drilling Process ◽  
Green Composites ◽  
Machining Properties

scholarly journals A Force Sensorless Method for CFRP/Ti Stack Interface Detection during Robotic Orbital Drilling Operations

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Qiang Fang ◽  
Ze-Min Pan ◽  
Bing Han ◽  
Shao-Hua Fei ◽  
Guan-Hua Xu ◽  
...  
Keyword(s):  
Cutting Force ◽  
Thrust Force ◽  
Cutting Parameters ◽  
Force Model ◽  
Drilling Process ◽  
Reinforced Plastics ◽  
Orbital Drilling ◽  
Drilling Parameters ◽  
Drilling Operations ◽  
Machining Properties

Drilling carbon fiber reinforced plastics and titanium (CFRP/Ti) stacks is one of the most important activities in aircraft assembly. It is favorable to use different drilling parameters for each layer due to their dissimilar machining properties. However, large aircraft parts with changing profiles lead to variation of thickness along the profiles, which makes it challenging to adapt the cutting parameters for different materials being drilled. This paper proposes a force sensorless method based on cutting force observer for monitoring the thrust force and identifying the drilling material during the drilling process. The cutting force observer, which is the combination of an adaptive disturbance observer and friction force model, is used to estimate the thrust force. An in-process algorithm is developed to monitor the variation of the thrust force for detecting the stack interface between the CFRP and titanium materials. Robotic orbital drilling experiments have been conducted on CFRP/Ti stacks. The estimate error of the cutting force observer was less than 13%, and the stack interface was detected in 0.25 s (or 0.05 mm) before or after the tool transited it. The results show that the proposed method can successfully detect the CFRP/Ti stack interface for the cutting parameters adaptation.

scholarly journals BAMBOO FIBER REINFORCED BINDERLESS GREEN COMPOSITES FROM STEAM-EXPLODED BAMBOO POWDER

2012 ◽  
Vol 06 ◽  
pp. 739-744
Author(s):  
HITOSHI TAKAGI ◽  
GOSHI TAKEICHI
Keyword(s):  
Tensile Strength ◽  
Tensile Behavior ◽  
Bamboo Fiber ◽  
Green Composites ◽  
Fiber Reinforced ◽  
Green Composite ◽  
Molding Temperature ◽  
Adhesion Behavior ◽  
Molding Condition ◽  
Bamboo Powder

In this paper, we attempted to prepare the binderless green composite using bamboo fiber and steam-exploded bamboo powder as matrix. The influence of molding conditions on their tensile behavior was investigated by changing the molding temperature, pressure and time. Except for the composites molded at low temperatures from 100°C to 120°C, their tensile strength decreased with increasing the molding temperature. When the molding time increased, their tensile strength decreased. Average tensile strength of the binderless bamboo green composite molded at 120°C and 10 MPa for 10 min was 170 MPa. The decreases in tensile strength of binderless composites molded at temperatures higher than 120°C may be responsible for the strength drop of the reinforcing bamboo fiber derived from thermal decomposition. In order to obtain detailed information about the adhesion behavior of bamboo powder and bamboo fiber, photomicrographs were taken of the fracture surfaces of the composites. The results show that molding condition, especially molding temperature, has a great effect on the mechanical properties of bamboo fiber reinforced binderless green composites.

Influence of Alkali Treatment on Mechanical Properties of Poly Lactic Acid Bamboo Fiber Green Composites

2015 ◽  
Vol 1110 ◽  
pp. 56-59 ◽  
Author(s):  
Shoma Maruyama ◽  
Hitoshi Takagi ◽  
Yoshitoshi Nakamura ◽  
Antonio Norio Nakagaito ◽  
Chizuru Sasaki
Keyword(s):  
Corn Starch ◽  
Alkali Treatment ◽  
Natural Fibers ◽  
Bamboo Fiber ◽  
Poly Lactic Acid ◽  
Green Composites ◽  
Pressing Method ◽  
The Matrix ◽  
Materials Research ◽  
Bamboo Fibers

In recent years, in order to reduce the environmental burden of composite materials, research has been conducted to develop composites made from plant-derived polymers and natural fibers, the so called green composites. In this study, green composites were made from polylactic acid (PLA), a bioplastic derived from corn starch, reinforced with bamboo fibers. The composites were manufactured by mixing short bamboo fibers and dispersion-type PLA resin. Subsequently, PLA/bamboo fiber sheets were molded by a hot pressing method. In order to improve the adhesion at the matrix/fiber interface and to obtain uniformly dispersed bamboo fibers in PLA matrix, the bamboo fibers were treated by alkali solution. It was found that the composites reinforced by alkali-treated bamboo fibers have higher strength than those based on untreated ones. Bamboo fibers were uniformly dispersed in PLA matrix with improved interfacial adhesion as lignin in bamboo fibers were removed by the alkali treatment. It was concluded that alkali treatment was an effective method for improvement of interfacial matrix/fiber adhesion in PLA/bamboo fiber-reinforced green composites.

Mechanical Characterization of Bamboo Fiber-Reinforced Green Composites

2013 ◽  
Vol 577-578 ◽  
pp. 81-84 ◽  
Author(s):  
Hitoshi Takagi ◽  
Toshihiro Fujii
Keyword(s):  
Tensile Strength ◽  
Mechanical Characterization ◽  
Bamboo Fiber ◽  
Green Composites ◽  
Fiber Reinforced ◽  
Final Fracture ◽  
Biodegradable Composites ◽  
Explosion Method ◽  
Bamboo Fibers

This paper deals with the mechanical behavior of bamboo fiber-reinforced biodegradable composites (green composites). A starch-based, dispersion type biodegradable resin was used as matrix polymer, and this matrix was reinforced by long bamboo fibers which were extracted by a steam-explosion method. The experimental results showed that the developed green composites possessed the flexural and tensile strength of 263 MPa and 270 MPa, respectively. The mechanical properties of the green composites were evaluated as a function of fiber content. It is found that the observed tensile strength was slightly lower than that of estimated values from the rule of the mixture. This discrepancy might be related to the misorientation of the bamboo fiber in the composites and to that the final fracture of composites is also governed by the presence of weak bamboo fiber.

A Technical Study of Hole Drilling in Ceramics/FRP Laminate Composite Components

2010 ◽  
Vol 97-101 ◽  
pp. 1965-1970 ◽  
Author(s):  
Zheng Lei ◽  
Wei Min Zuo ◽  
Bao Fu Feng ◽  
Jun Tan Yuan
Keyword(s):  
Ceramic Composite ◽  
Laminate Composite ◽  
Process Equipment ◽  
Hole Drilling ◽  
Drilling Process ◽  
Process Technology ◽  
Element Analysis ◽  
Feeding Mode ◽  
Complex Alloy ◽  
Machining Properties

Drilling process of the ceramic composite component (ceramics/FRP/aluminum alloy), as an example of similar ceramics/FRP laminate composite components, was studied intensively. According to the diverse machining properties of the composing materials of ceramic composite components, the special thinwall diamond core bit was developed, with copper based matrix of complex alloy and hot pressing process. Through machining competitive experiments, the feeding mode with constant pressure was determined. After analyzing the diverse hole defects, the process equipment with compressive pre stress was introduced to improve the hole drilling quality, with good validity proved theoretically by the finite element analysis and on this condition, water can be used as the coolant. The process technology presented in this paper can be used for hole drilling in similar composite components made of the same composing materials.

FLEXURAL STRENGTH AND IMPACT ENERGY OF MICROFIBRIL BAMBOO FIBER REINFORCED ENVIRONMENT-FRIENDLY COMPOSITES BASED ON POLY-LACTIC ACID RESIN

2011 ◽  
Vol 25 (31) ◽  
pp. 4195-4198 ◽  
Author(s):  
SUJITO ◽  
HITOSHI TAKAGI
Keyword(s):  
Lactic Acid ◽  
Flexural Strength ◽  
Impact Energy ◽  
Bamboo Fiber ◽  
Poly Lactic Acid ◽  
Flexural Properties ◽  
Green Composites ◽  
Energy Increase ◽  
Environment Friendly ◽  
Biodegradable Poly

Environment-friendly or "green" composites (GCs) made from micro-fibril bamboo fiber (BF) and biodegradable poly-lactic acid (PLA) resin were fabricated using a hot-pressing methods. The effect of BF content on the flexural properties and impact energy of the GCs was investigated. The results show that the flexural properties and impact energy of the GC samples are tremendously affected by the addition of BF. Both the flexural properties and impact energy increase with increasing the BF content up to 40% and then decrease with BF contents less or more than 40% by mass. This was because of the existence of internal defects such as voids was observed for the GC samples reinforced with less or more than 40% mass of BF.

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