Elucidating the large variation in ion diffusivity of microelectronic packaging materials

The risk of corrosion poses a challenge to meet the stringent reliability requirements of microelectronic devices that are used in harsh environments. Microelectronic devices are often encapsulated in polymer packaging materials, which protect them from corrosion. These polymers are, however, not completely hermetic and thus allow small amounts...

Understanding the transport phenomena leading to tarnishing of the reflecting silver layer causing reduced light output of LEDs

An overview of scanning acoustic microscope, a reliable method for non-destructive failure analysis of microelectronic components

In a highly competitive and demanding microelectronics market, reliable non-destructive methods for quality control and failure analysis of electronic components are highly demanded. Any robust non-destructive method should be capable of dealing with the complexity of miniaturized assemblies such as chip-scale packages and 3D IC stacks. Scanning...

Solder joint reliability in solid-state lighting applications

Lighting is an advancing phenomenon both on the technology and on the market level due to the rapid development of the solid-state lighting technology. The interest in solder joint reliability has increased by the introduction of the so-called high brightness leadless type of packages. Solder joint reliability is one of the main failure modes in...

An introduction to system reliability for solid-state lighting

Solid-State Lighting (SSL) applications are slowly but gradually pervading into our daily life. An SSL system is composed of an light-emitting diode (LED) engine with a microelectronic driver(s) in a housing that also supplies the optic design. Knowledge of system-level reliability is crucial for the business success of future SSL systems, and...

Establishment of the coarse grained parameters for epoxy-copper interfacial separation

Atomistic coarse grained parameters were calculated from a non-equilibrium molecular dynamics simulation of the separation of an epoxy-copper interface. The methodology to determine the interaction energy and the equilibrium distance between the interfacial materials at a minimum energy is established. The traction-displacement relations of the...

Establishment of the mesoscale parameters for epoxy-copper interfacial separation

Mesoscale parameters, which describe the atomic interactions of the polymer-metal interface at the separation process, are important in the development of a coarse grain model for the interfacial adhesion study. A non-equilibrium molecular dynamics model is established to obtain the traction-displacement relations of the separation of epoxy...

The mechanical properties modeling of nano-scale materials by molecular dynamics

We propose a molecular modeling strategy which is capable of mod-eling the mechanical properties on nano-scale low-dielectric (low-k) materials. Such modeling strategy has been also validated by the bulking force of carbon nano tube (CNT). This modeling framework consists of model generation method, boundary condition setting and result...

LED system reliability

This paper presents our effort to predict the system reliability of Solid State Lighting (SSL) applications. A SSL system is composed of a LED engine with micro-electronic driver(s) that supplies power to the optic design. Knowledge of system level reliability is not only a challenging scientific exercise but it is also crucial for successful...

Why does intermittent hydrostatic pressure enhance the mineralization process in fetal cartilage?

The purpose of this study was to determine which factor is the most likely one to have stimulated the mineralization process in the in vitro experiments of Klein-Nulend et al. (Arth. Rheum., 29, 1002-1009, 1986). in which fetal cartilaginous metatarsals were externally loaded with an intermittent hydrostatic pressure. by compressing the gas...

Design approach to sealant selection for the life of the well

Recent experience in the field has demonstrated that the mechanical properties of the annular sealant are a critical factor in the success of a well. A demanding operational regime of the well such as High Pressure/High Temperature (HP/HT) and well interventions, e.g. pressure testing stimulation, put a strong emphasis on the mechanical design...

Orthodontic treatment: Introducing finite element analysis

The aim of orthodontic treatment is the displacement of teeth by means ofspecial appliances, like braces and brackets. Through these appliances the orthodontist can apply a set of forces to the teeth which wilt result in its displacement through the jawbone. Finite Element analysis of this process enables to comprehend the influence of the...

A regulatory model for tissue differentiation using poroelastic theory

The introduction of poroelastic formulations into finite element analysis allowed a continuum approach to model soft hydrated tissues of the body, such as skin, cartilage, and fibrous connective tissue. The problem addressed in this study is the applicability of poroelasticity for the prediction of soft tissue differentiation processes found...

3D-kinematische modelvorming ten behoeve van kwantitatieve beschrijving van houdingen en bewegingingen

In het kader van het project "3D-kinematische modelvorming" om houdingen en bewegingen kwantitatief te beschrijven is een inventarisatie gemaakt van bestaande kinematische modellen. Deze inventarisatie, bestaande uit een literatuuronderzoek, leverde twee hoofdgroepen van modelvorming: (1) de Euler-hoekenmethode : deze methode maakt gebruik van...