Numerical modeling of soil behaviour under blast loading

Trade Agreement: NONE Tendering Procedures: The bidder must supply Canadian goods and/or services Attachment: None Competitive Procurement Strategy: Best Overall Proposal Comprehensive Land Claim Agreement: No Nature of Requirements: Numerical modeling of soil behaviour under blast loading

Objectives:The work objectives for this contract are the following: The main objective of this contract is to improve numerical modeling of the soil response under blast loading by implementing constitutive material models in LS-DYNA for different types of soil, by determining its parameters using laboratory tests and in situ tests and then, by validating the results with field experimental data. The level of degree of water saturation and the rate of deformation will have to be included in the soil constitutive models to be developed. Other parameters such as level of compaction and particle size and distribution may have to be included in order to improve soil behaviour prediction under blast conditions.

Background DRDC Valcartier often uses empirical model such as Westine model to predict the deformation of simple geometries [Toussaint and Bouamoul, 2010]. Measurements (displacements, velocities) between experimental and numerical results on target are usually compared and validated. However, when complex interactions between the soil and structure must be modeled, or when the test conditions are out of the empirical model tested conditions, a better understanding of soil behaviour is required.

Constitutive soil models developed for static or quasi-static loading are different than the ones developed to simulate soil behaviour under high strain rate loading [Wang and Lu (2003), An J. (2010)]. Predicting the soil behaviour under blast loading is challenging because of the variety of parameters influencing its behaviour. The soil loading conditions evolves from a pressure wave propagation (near field) to a stress wave propagation (far field) and is influenced by parameters such as the type of soil, degree of water saturation, size of particles, particles distribution, strain rate effect, mine depth of burial, etc. are all parameters that may have to be considered. The variability in experimental blast tests have shown the importance of identifying these critical factors in order to get more reproducibility in field trials and in order to develop good constitutive soil models that will be used to predict mine blast effects on structures. For example, Wang et Lu (2003), Wang et al. (2004), Grujicic et al. (2008), Grujicic et al. (2009), Pandurangan (2009), An (2010) and An et al. (2011) have implemented factors such as the degree of water saturation and the rate of deformation in their soil material models.

In order to achieve the project objectives, this contract will carryout 6 tasks. Task 1: Literature review Task 2: Development of a soil constitutive model Task 3: Implementation of the constitutive soil material models in LS-DYNA Task 4: Laboratory tests and in situ tests Task 5: Constitutive soil model validation with FE simulation Task 6: Reports and deliverables

Period of Contract The period of the resulting contract is from date of contract to March 31, 2015. Client department : The services will be rendered to Defence Research and Development Canada (DRDC-Valcartier).

Estimated funding available The maximum funding available for the contract resulting from the bid solicitation is $119,000.00 CAD (Goods and Services Tax or the Harmonized Sales Tax extra, as appropriate). Bids valued in excess of this amount will be considered non-responsive. This disclosure does not commit Canada to pay the maximum funding available.

Mandatory criteria 1. According to:

The contractor must implement the routines and sub-routines developed for the soil constitutive models (for sandy-gravel soil and clayed soil) and their corresponding relationships (equation of state, strength model, damage/failure model, erosion model) in LS-DYNA software.

The Bidder must demonstrated that LS-DYNA and related equipment to use this software must be available and used by the bidder.

Point Rated Technical Criteria Technical Proposal 50 points minimum 34 points Expertise 45 points, minimum 25 points Total: 95 points minimum 60 points.

Basis of Selection - Highest Rated Within Budget

To be declared responsive, a bid must

(a) comply with all the requirements of the bid solicitation; (b) meet all mandatory technical evaluation criteria; (c) obtain the required minimum points for each group of criteria a pass mark; and (d) obtain the required minimum points overall for the technical evaluation criteria which are subject to point rating. Bids not meeting (a) or (b) or (c) or (d) will be declared non responsive. The responsive bid with the highest number of points will be recommended for award of a contract, provided that the total evaluated price does not exceed the budget available for this requirement. In the event that the highest number of points is obtained by more than one responsive bid, the responsive bid with the lowest evaluated price will be recommended for award of a contract.

Intellectual property rights

Any intellectual property rights arising from the performance of the Work under the resulting contract will belong to Canada.

Code of Conduct

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Other information

- The requirement is subject to the provisions of the Agreement on Internal Trade (AIT). - The requirement is limited to Canadian services. - This PWGSC office provides provides procurement services to the public in both official languages.

W7701-135578/A Brisebois, Aline N° de téléphone - (418) 649-2883 Nº fax - (418) 648-2209 Delivery Date: Above-mentioned

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