Postdoctoral researcher
The Infrastructure Materials Group at the Engineering Laboratory of the National Institute of Standards
and Technology (NIST) is seeking qualified persons (U.S. Citizens preferred) to develop test and material
standards to assess the long-term wind resistance of asphalt shingles through accelerated weathering,
multi-scale mechanical testing, and finite-element strength modeling.
This postdoctoral researcher should have knowledge of evaluating the wind performance of asphalt
shingle roof coverings and expertise in the following areas: polymer degradation characterization,
instrumented mechanical testing for strain evolution, structural health monitoring, and material damage
analysis or modeling. The researcher should also have a working knowledge of current building codes
used in the United States and, preferably, an Engineer in Training (EIT) license.
If selected, you will play a significant role in the Disaster and Failures Studies (DFS) Program’s Hurricane
Ian Study program for roofing material evaluation, which includes working with NIST staff and external
partners on planning and executing experimental research to study the effects of Hurricane Ian’s wind
hazards on roofing material, including asphalt shingles. These findings, if warranted, will lead to
proposing guidance, codes, and/or standards provisions for improved resilience of coastal communities.
Evaluating the wind performance of asphalt shingle roof coverings
- US citizens preferred; currently living in the United States.
- Ph.D. in Chemistry/Physics/Material Science/Civil Engineering with an emphasis on multi-scale
structural testing. Preference for candidates having an Engineer-In-Training (EIT) certification. - 3+ years of expertise in the design and implementation of large-scale structural experimental
programs in the fields of structural retrofitting, residential construction, adhesives used in
building construction, polymer composites, and natural hazards. - 2+ years of experience in characterizing fracture mechanics properties of adhesive materials
used in building materials, including pressure sensitive tapes, elastomeric sealants, and hot melt
adhesives. - 1+ year(s) of experience in mechanical, chemical, and physical characterization of asphalt-based
adhesives used on asphalt shingles. - 1+ year(s) of research experience with accelerated weathering and strength testing of asphalt
shingle roof covering materials. - 1+ year(s) of demonstrated experience with using finite element simulations to evaluate the
capacity of adhesive materials used on asphalt shingles. - Expertise in Ansys LS-DYNA, Abaqus/Explicit, Origin, SolidWorks, AutoCAD and Isight is required.
- Understanding of existing ASTM D3161 and D7158 test standards for asphalt shingles.
Experience running the relevant test methods is preferred. - 1+ year(s) of demonstrated experience with using FTIR spectroscopy and research grade
laboratory weathering devices. - 5+ years of demonstrated experience with operating universal testing machines and strain
instrumentation. - Expertise with developing mechanical test methods, including fixture design and construction,
to evaluate the wind performance of hip and ridge asphalt shingles. - Prior experience communicating, collaborating, and presenting to roofing material associations
and standard development committees. - Membership in ASTM is required. Participating as a voting member in relevant committees is
preferred. - Strong oral and written communication skills.
Key responsibilities will include, but are not limited to:
- Design and implement an experimental program to investigate factors that affect the wind
performance of asphalt shingles. The program should examine the effects of weathering,
installation, and material properties, and evaluate existing standard test methods. - Characterize the effect of laboratory weathering on the long-term wind capacity of asphalt
shingles. - Develop new methods, if warranted, for accelerated aging of roofing materials.
- Develop new test methods, if warranted, to evaluate wind uplift resistance of asphalt shingles,
including hip and ridge shingles. - Develop and validate non-linear finite element models to assess the strength of asphalt shingles
and the sealants used in shingle installation using a fracture mechanics-based approach. - Develop sensitivity and service life prediction models for asphalt shingle roof cover materials
based on simulated and experimental data. - Disseminate research results through presentations at conferences, codes and/or standards
meetings, and publication of authoritative journal papers and reports. - Form working connections with various roofing stakeholders, including trade associations and
standard development committees. - Provide technical leadership on the failure mechanisms for roofing materials based on field work
and/or laboratory studies.