Three-Point Bending Test Behaviour of a QFN Semiconductor Package

This paper discusses some issues in micromechanical property of a newly developed Quad Flat No-lead (QFN) 3D stacked die package using three-point bending test approach. The relevant test methodologies were carried out in order to observe the flexural stress, strain, maximum load and deflection of the package. While performing the test, these QFN packages were positioned on the three points test bench, and the specific applied load was then applied and moved down until the package was clearly bent and broken. The related findings indicated that the maximum load was found to be at 251.52 N and the maximum deflection was obtained at 0.41 mm. The results were important for setting related testing parameters (load, stress and strain) before applying the three point cyclic bending test on the QFN stacked die package as the future work.

Download Full-text

Fracture Toughness of High-Performance Concrete on Three-Point Bending Notched Beams at Elevated Temperature

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.89-91.159 ◽

2010 ◽

Vol 89-91 ◽

pp. 159-164 ◽

Cited By ~ 1

Author(s):

Samira Djaknoun ◽

Evariste Ouedraogo ◽

Ali Ahmed Benyahia

Keyword(s):

Fracture Toughness ◽

Nuclear Power ◽

High Performance ◽

Applied Load ◽

Thermal Loading ◽

High Performance Concrete ◽

Thermal Conditions ◽

Mechanical Tests ◽

Bending Test ◽

Three Point Bending

High-performance concrete (HPC) are advanced materials used in advances applications such as tunnels or nuclear power plant in which they can be accidentally submitted to severe stress or thermal conditions. The present study deals with the material response to thermal loading conditions. The main objective of this research is the characterization of the fracture toughness under Mode I at high temperature of high performance mortars by using notched specimens in three-point bending test in accordance with the RILEM recommendations. The mechanical loading is applied to the specimens while heated at various temperatures ranging from 25 to 900°C in isothermal conditions. The maximum applied load is found to be maximum at 300°C temperature and then to decrease sharply at higher temperatures. Analysis of SEM micrographs undertaken on the heated specimens after mechanical tests helps in the understanding of the material macroscopic behaviour. The evaluation of the material toughness during the hot testing is undertaken through analytical approach based on Fracture Mechanics. Lastly, the stress intensity factor as well as the energy of fracture evolves similarly versus temperature as the maximum applied load.

Download Full-text

ANALISA HASIL UJI KEKUATAN TARIK, TEKAN & STRUKTUR MAKRO SAMPAH PLASTIK JENIS PET, HDPE, DAN CAMPURAN (PET+HDPE)

JTAM ROTARY ◽

10.20527/jtam_rotary.v3i2.4366 ◽

2021 ◽

Vol 3 (2) ◽

Author(s):

Holy Ramagisandy ◽

Rudi Siswanto

Keyword(s):

Tensile Strength ◽

Bending Strength ◽

Maximum Load ◽

Bending Test ◽

Stress And Strain ◽

Bending Stress ◽

Test Results ◽

Recycled Pet ◽

Tensile Strength Test ◽

Used Oil

Plastik is a material which has difficult to decompose. Therefore, the utilization of waste into useful material is important to do. This study aims to identify the tensile strength, bending, and macro structure of recycled PET, HDPE, and PET + HDPE plastik waste mixtures and recommendations for plastik products that fit the characteristics of these plastik types. PET and HDPE plastik waste is melted with oil and reprinted into tensile and bending test samples in accordance with predetermined variations, and then the results of the fracture are analyzed in a macro structure. Based on tensile testing, the tensile strength test results have the highest stress and strain values obtained in the mixture of 40% + HDPE 60% (B2) used oil specimens of 10.58 MPa and strain values of 11.98%. The results of bending strength testing which has the highest bending stress value and maximum load value are obtained in plastik mixture specimens with 30% used oil mixture + 70% HDPE (B1) of 11.58 MPa and for maximum load values of 43.33 KN. Testing the tensile strength and bending strength of the type of plastik mixture Oil and HDPE + PET (50%: 50%), the results obtained can still not be recommended to be used as a paving block product because the value of stress, strain, bending stress, and the maximum load is still relatively low, namely for the tensile test the highest variation of stress value is 5.21 MPa, the highest variation of strain value is 5.23%, the maximum load value is 10 KN, and the highest variation of bending stress value is 40% + 60% by 4.01 MPa.

Download Full-text

Mechanical Properties of Nano-Laminar Glass/Metal Composite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.733 ◽

2007 ◽

Vol 561-565 ◽

pp. 733-736 ◽

Cited By ~ 1

Author(s):

Hideki Kakisawa ◽

Taro Sumitomo ◽

Yusuke Owaki ◽

Yutaka Kagawa

Keyword(s):

Maximum Load ◽

Raw Material ◽

Bending Test ◽

Metal Composite ◽

Three Point Bending ◽

Notched Specimens ◽

Glass Flake ◽

Work Of Fracture ◽

Glass Metal ◽

Green Sample

A nano-laminar glass/metal composite was fabricated. Glass flake powder coated with silver was used as the raw material, and was sintered by hotpressing. Samples fabricated in the optimum condition had a dense, laminar microstructure originating from the aligned flake powder. The result of a three-point bending test for the samples suggested that the alignment of the powder was essential for fracture behavior: When the powder was aligned in advance during the green sample fabrication, the sample fractured stably after the maximum load, while the samples fabricated by simple hotpressing of the powder without pre-alignment fractured unstably. Work of fracture of the sample in which the powder was well aligned was measured with chevron notched specimens; a significantly high value of about 300J/mm2 was obtained.

Download Full-text

Effect of Gamma-Irradiation towards Stress-Strain Curve of Single Die QFN Package

Materials Science Forum ◽

10.4028/www.scientific.net/msf.694.620 ◽

2011 ◽

Vol 694 ◽

pp. 620-624 ◽

Cited By ~ 3

Author(s):

Wan Yusmawati Wan Yusoff ◽

Azman Jalar ◽

Norinsan Kamil Othman ◽

Irman Abdul Rahman

Keyword(s):

Gamma Irradiation ◽

Strain Curve ◽

Stress And Strain ◽

Flexural Stress ◽

Stress Strain Curve ◽

Stress Strain ◽

Three Point Bending ◽

Strain Behaviour ◽

The Relationship ◽

Different Doses

The aim of the research was to establish the relationship between stress-strain behaviour of single die Quad Flat No lead (SDQFN) and degradation by gamma irradiation. The SDQFN was exposed to Cobalt-60 with different doses from 0.5 Gy, 1.5 Gy, 5.0 Gy, 10.0 Gy and 50.0 kGy. The three-point bending technique was used to measure the flexural stress and strain of the package behaviour relations. After exposing with gamma radiation, the result showed the decreasing in the strength of the package behaviour of irradiated SDQFN when increasing the dose of gamma irradiation. The highest gamma irradiation dose used in this work produced the highest change in stress-strain behaviour of irradiated SDQFN.

Download Full-text

New novel thermal insulation and sound-absorbing materials from discarded facemasks of COVID-19 pandemic

Scientific Reports ◽

10.1038/s41598-021-02744-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

M. Ali ◽

R. Almuzaiqer ◽

K. Al-Salem ◽

A. Alabdulkarem ◽

A. Nuhait

Keyword(s):

Thermal Insulation ◽

Sound Absorption ◽

Thermo Gravimetric Analysis ◽

Bending Test ◽

Gravimetric Analysis ◽

Flexural Stress ◽

Three Point Bending ◽

New Novel ◽

Absorbing Materials ◽

Biological Contaminants

AbstractDue to the COVID-19 pandemic, people were encouraged and sometimes required to wear disposable facemasks, which then are discarded creating an environmental problem. In this study, we aim at investigating novel ideas to recycle wasted facemasks in order to lower the environmental impact. An experimental study has been carried out to investigate the possibility of using discarded masks for thermal insulation and sound absorption. The wasted masks are simulated by new masks, which stripped off the nose clips, elastic ear loops and are heated to 120 °C for one hour to kill any biological contaminants. The masks are also melted to investigate their thermal insulation and sound absorption properties. Results show that the thermal conductivity coefficients of the loose and melted masks are 0.03555 and 0.08683 W/m K, respectively, at room temperature of about 25 °C. Results show also that the sound absorption coefficient for loose masks is above 0.6 for the frequency range 600–5000 Hz. The loose facemasks are found to be thermally stable up to 295 °C, elastic ear loops at 304.7 °C, and the composite (melted) facemasks at 330.0 °C using the thermo-gravimetric analysis. Characterization of the facemask’s three-layer fibers and the composite (melted) samples is obtained using scanning electron microscopy (SEM). The three-point bending test is obtained for the composite specimens showing good values of flexural stress, flexural strain, and flexural elastic modulus. These results are promising about using such discarded masks as new thermal insulation and sound-absorbing materials for buildings replacing the synthetic or petrochemical insulation materials.

Download Full-text

Effect of Slope Grain on Mechanical Properties of Different Wood Species

Materials ◽

10.3390/ma13071503 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1503 ◽

Cited By ~ 1

Author(s):

Przemysław Mania ◽

Filip Siuda ◽

Edward Roszyk

Keyword(s):

Mechanical Properties ◽

Wood Species ◽

Maximum Load ◽

Modulus Of Rupture ◽

Bending Test ◽

Mechanical Parameters ◽

Deviation Angle ◽

Hand Tools ◽

Domestic Species ◽

Three Point Bending

The aim of the presented study is to determine the relationship between mechanical parameters of selected wood species (Carya sp., Fagus sylvatica L., Acer platanoides L., Fraxinus excelsior L., Ulmus minor Mill.) used for the production of hand tools and drumsticks and the grain deviation angle from the rectilinear pattern. Modulus of rupture (MOR), modulus of elasticity (MOE), elastic strain and work to maximum load (WML) in the three-point bending test were determined. The results obtained show that the values of all the mechanical parameters measured for hickory wood are higher than those obtained for domestic species. As the grain deviation angle from parallelism increases, the mechanical properties of all analyzed wood species decrease. The greatest influence of grain deviation angle on mechanical parameters was recorded for the work to maximum load values.

Download Full-text

Discrete element method to model cracking for two layer systems

TAPPI Journal ◽

10.32964/tj18.2.101 ◽

2019 ◽

Vol 18 (2) ◽

pp. 101-108

Author(s):

Daniel Varney ◽

Douglas Bousfield

Keyword(s):

Discrete Element Method ◽

Flexural Modulus ◽

Single Layer ◽

Discrete Element ◽

Flexural Stress ◽

Layer System ◽

Three Point Bending ◽

Moving Force ◽

Coating Layers ◽

Element Method

Cracking at the fold is a serious issue for many grades of coated paper and coated board. Some recent work has suggested methods to minimize this problem by using two or more coating layers of different properties. A discrete element method (DEM) has been used to model deformation events for single layer coating systems such as in-plain and out-of-plain tension, three-point bending, and a novel moving force picking simulation, but nothing has been reported related to multiple coating layers. In this paper, a DEM model has been expanded to predict the three-point bending response of a two-layer system. The main factors evaluated include the use of different binder systems in each layer and the ratio of the bottom and top layer weights. As in the past, the properties of the binder and the binder concentration are input parameters. The model can predict crack formation that is a function of these two sets of factors. In addition, the model can predict the flexural modulus, the maximum flexural stress, and the strain-at-failure. The predictions are qualitatively compared with experimental results reported in the literature.

Download Full-text

Additive Manufacturing-Based In Situ Consolidation of Continuous Carbon Fibre-Reinforced Polycarbonate

Materials ◽

10.3390/ma14092450 ◽

2021 ◽

Vol 14 (9) ◽

pp. 2450

Author(s):

Andreas Borowski ◽

Christian Vogel ◽

Thomas Behnisch ◽

Vinzenz Geske ◽

Maik Gude ◽

...

Keyword(s):

Additive Manufacturing ◽

Carbon Fibre ◽

Bending Test ◽

Thermoplastic Composites ◽

Experimental Investigations ◽

Material Structure ◽

Three Point Bending ◽

Continuous Fibre ◽

Local Material

Continuous carbon fibre-reinforced thermoplastic composites have convincing anisotropic properties, which can be used to strengthen structural components in a local, variable and efficient way. In this study, an additive manufacturing (AM) process is introduced to fabricate in situ consolidated continuous fibre-reinforced polycarbonate. Specimens with three different nozzle temperatures were in situ consolidated and tested in a three-point bending test. Computed tomography (CT) is used for a detailed analysis of the local material structure and resulting material porosity, thus the results can be put into context with process parameters. In addition, a highly curved test structure was fabricated that demonstrates the limits of the process and dependent fibre strand folding behaviours. These experimental investigations present the potential and the challenges of additive manufacturing-based in situ consolidated continuous fibre-reinforced polycarbonate.

Download Full-text

Effect of Concrete Mixture Composition on Acoustic Emission and Fracture Parameters Obtained from Three-Point Bending Test

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1100.152 ◽

2015 ◽

Vol 1100 ◽

pp. 152-155

Author(s):

Libor Topolář ◽

Hana Šimonová ◽

Petr Misák

Keyword(s):

Acoustic Emission ◽

Bending Test ◽

Mixture Composition ◽

Three Point Bending ◽

Concrete Mixtures ◽

Fracture Parameters ◽

Fracture Tests ◽

Stress Behaviour ◽

Bending Fracture ◽

Fracture Processes

This paper reports the analysis of acoustic emission signals captured during three-point bending fracture tests of concrete specimens with different mixture composition. Acoustic emission is an experimental tool well suited for monitoring fracture processes in material. The typical acoustic emission patterns were identified in the acoustic emission records for three different concrete mixtures to further describe the under-the-stress behaviour and failure development. An understanding of microstructure–performance relationships is the key to true understanding of material behaviour. The acoustic emission results are accompanied by fracture parameters determined via evaluation of load versus deflection diagrams recorded during three-point bending fracture tests.

Download Full-text