where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

LECOEUR ELECTRONIQUE
The Specialist of electronics for ultrasonic testing.

430 views
Technical Discussions
Emil Hasl
Emil Hasl
07:23 May-19-2001
Fiber orientation in SMC

I am in search of a nondestructive test method to view, or at least detect bad flow conditions, voids and delaminations in a SMC part.
The composite is a vinyl ester based sheet molding compound.
It has 63% glass fiber content, and the glass fibers are 1" long.
The density of the glass is 2,6 g/cm3.
The density of the matrix is 1,15 g/cm3.

I am not interested in checking the whole part, it is pretty large, the total mass is 10kg.
The thickest section I neeed to check is about 25mm thick.

Is anyone aware of a commercially available system for checking something like this?

Thank you!
Emil Hasl
Mechanical Engineer





    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
05:05 May-21-2001
Re: Fiber orientation in SMC
: I am in search of a nondestructive test method to view, or at least detect bad flow conditions, voids and delaminations in a SMC part.

It may be possible to find these conditions using a number of commercially available ultrasonic flaw detectors with low frequency transducers. Certainly voids and delaminations will be detectable if they're large enough. Minimum detectable void/delamination size would have to be determined experimentally, and will depend on the sound transmission properties of the material, but it's probably on the order of five or six millimeters. If your particular material is excessively attenuating or scattering the minimum detectable flaw size will be higher.

As for fiber misorintation, I would look at sound velocity and attenuation in good and band samples and see if there are changes that correlate with the condition you're looking for. That test is often useful with graphite/epoxy composites and it may be applicable to your material as well.

We'd be happy to examine samples for you if you're interested.

--Tom Nelligan
Panametrics, Inc.



    
 
 

Product Spotlight

Compact NDT inspection-heads for measurements with active thermography

The compact inspection head is suitable for thermographic ndt tasks. The uncooled infrared camera
...
is specially developed for NDI-tasks and offers a thermal sensitivity until now known only from thermal imagers with cooled detector. All required components and functions are integrated into the inspection-head. You will only need an ethernet cable to connect the sensor with the evaluation system.
>

SITEX CPSERIES

Teledyne ICM’s CPSERIES has been designed with a view to revolutionizing the handling and perfor
...
mances of portable X-Ray sets. Despite having managed to halve the weight of similar portable X-Ray generators available on the market (while continuing to provide the same power output), the SITEX CPSERIES generators feature a shutter, a laser pointer, a beryllium window, an aluminum filter and two integrated diaphragms (customized sizes are available upon request). Without compromising the robustness and reliability for which ICM products are renowned, the small size and light weight of the SITEX CPSERIES will radically change the way that you perform your RT inspections. And you will see a positive impact in terms of both quality and return on investment (ROI).
>

Trade-In Offer

We are offering our existing clients trade-in against Wavemaker® G3 systems, Standard (Blue) inflat
...
able rings and modules for excellent deals on the latest Wavemaker® G4mini system.
>

ISAFE3 Intrinsically Safe Sensor System

ISAFE3 intrinsically safe sensor system of Vallen Systeme is especially targeted at the petrochemica
...
l - as well as oil and gas transportation industry. The sensor system is designed for permanent monitoring or periodic inspection tasks. Sensors are available for different AE-frequency ranges optimized for corrosion and fatigue crack detection and other applications. The ISAFE 3 sensor system consists of an AE-sensor (model ISAS3) certified according to ATEX/IEC for installation in zone 0, gas group IIC, IP68, 20 to +60 °C, and a signal isolator (model SISO3) certified for installation in zone 2. An ISAS3 sensor can be mounted in atmosphere or submerged, e.g. in water or crude oil. It is supported by mounting tools for temporary (magnets) or permanent (welded) installation. ISAFE3 supports automatic sensor coupling test and can be used with any AE signal processor supporting 28V supply at 90 mA peak, e.g. Vallen Systeme ASIP-2/A.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window